diff --git a/BasiliskII/src/Unix/configure b/BasiliskII/src/Unix/configure
index 690f570b..d011a93f 100755
--- a/BasiliskII/src/Unix/configure
+++ b/BasiliskII/src/Unix/configure
@@ -2504,78 +2504,19 @@ HAVE_LIBPOSIX4=no
 fi
 
   if [ "x$HAVE_LIBPOSIX4" = "xno" ]; then
-        for ac_func in semget
-do
-echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2511: checking for $ac_func" >&5
-if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&6
-else
-  cat > conftest.$ac_ext <<EOF
-#line 2516 "configure"
-#include "confdefs.h"
-/* System header to define __stub macros and hopefully few prototypes,
-    which can conflict with char $ac_func(); below.  */
-#include <assert.h>
-/* Override any gcc2 internal prototype to avoid an error.  */
-/* We use char because int might match the return type of a gcc2
-    builtin and then its argument prototype would still apply.  */
-char $ac_func();
-
-int main() {
-
-/* The GNU C library defines this for functions which it implements
-    to always fail with ENOSYS.  Some functions are actually named
-    something starting with __ and the normal name is an alias.  */
-#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
-choke me
-#else
-$ac_func();
-#endif
-
-; return 0; }
-EOF
-if { (eval echo configure:2539: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
-  rm -rf conftest*
-  eval "ac_cv_func_$ac_func=yes"
-else
-  echo "configure: failed program was:" >&5
-  cat conftest.$ac_ext >&5
-  rm -rf conftest*
-  eval "ac_cv_func_$ac_func=no"
-fi
-rm -f conftest*
-fi
-
-if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
-  echo "$ac_t""yes" 1>&6
-    ac_tr_func=HAVE_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
-  cat >> confdefs.h <<EOF
-#define $ac_tr_func 1
-EOF
- 
-else
-  echo "$ac_t""no" 1>&6
-fi
-done
-
-    if [ "x$ac_cv_func_semget" = "xno" ]; then
-      { echo "configure: error: You need POSIX.4 semaphores to run Basilisk II." 1>&2; exit 1; }
-    else
-      SEMSRCS="posix_sem.cpp"
-    fi
+        SEMSRCS="posix_sem.cpp"
   else
     LIBS="$LIBS -lposix4"
   fi
 fi
 
 echo $ac_n "checking for ANSI C header files""... $ac_c" 1>&6
-echo "configure:2574: checking for ANSI C header files" >&5
+echo "configure:2515: checking for ANSI C header files" >&5
 if eval "test \"`echo '$''{'ac_cv_header_stdc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2579 "configure"
+#line 2520 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 #include <stdarg.h>
@@ -2583,7 +2524,7 @@ else
 #include <float.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2587: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2528: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -2600,7 +2541,7 @@ rm -f conftest*
 if test $ac_cv_header_stdc = yes; then
   # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 2604 "configure"
+#line 2545 "configure"
 #include "confdefs.h"
 #include <string.h>
 EOF
@@ -2618,7 +2559,7 @@ fi
 if test $ac_cv_header_stdc = yes; then
   # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 2622 "configure"
+#line 2563 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 EOF
@@ -2639,7 +2580,7 @@ if test "$cross_compiling" = yes; then
   :
 else
   cat > conftest.$ac_ext <<EOF
-#line 2643 "configure"
+#line 2584 "configure"
 #include "confdefs.h"
 #include <ctype.h>
 #define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
@@ -2650,7 +2591,7 @@ if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
 exit (0); }
 
 EOF
-if { (eval echo configure:2654: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2595: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   :
 else
@@ -2677,17 +2618,17 @@ for ac_hdr in unistd.h fcntl.h sys/time.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:2681: checking for $ac_hdr" >&5
+echo "configure:2622: checking for $ac_hdr" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2686 "configure"
+#line 2627 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2691: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2632: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -2715,14 +2656,14 @@ done
 
 
 echo $ac_n "checking whether byte ordering is bigendian""... $ac_c" 1>&6
-echo "configure:2719: checking whether byte ordering is bigendian" >&5
+echo "configure:2660: checking whether byte ordering is bigendian" >&5
 if eval "test \"`echo '$''{'ac_cv_c_bigendian'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   ac_cv_c_bigendian=unknown
 # See if sys/param.h defines the BYTE_ORDER macro.
 cat > conftest.$ac_ext <<EOF
-#line 2726 "configure"
+#line 2667 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/param.h>
@@ -2733,11 +2674,11 @@ int main() {
 #endif
 ; return 0; }
 EOF
-if { (eval echo configure:2737: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2678: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   # It does; now see whether it defined to BIG_ENDIAN or not.
 cat > conftest.$ac_ext <<EOF
-#line 2741 "configure"
+#line 2682 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/param.h>
@@ -2748,7 +2689,7 @@ int main() {
 #endif
 ; return 0; }
 EOF
-if { (eval echo configure:2752: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2693: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_bigendian=yes
 else
@@ -2768,7 +2709,7 @@ if test "$cross_compiling" = yes; then
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 2772 "configure"
+#line 2713 "configure"
 #include "confdefs.h"
 main () {
   /* Are we little or big endian?  From Harbison&Steele.  */
@@ -2781,7 +2722,7 @@ main () {
   exit (u.c[sizeof (long) - 1] == 1);
 }
 EOF
-if { (eval echo configure:2785: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2726: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_c_bigendian=no
 else
@@ -2805,12 +2746,12 @@ EOF
 fi
 
 echo $ac_n "checking for working const""... $ac_c" 1>&6
-echo "configure:2809: checking for working const" >&5
+echo "configure:2750: checking for working const" >&5
 if eval "test \"`echo '$''{'ac_cv_c_const'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2814 "configure"
+#line 2755 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -2859,7 +2800,7 @@ ccp = (char const *const *) p;
 
 ; return 0; }
 EOF
-if { (eval echo configure:2863: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2804: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_const=yes
 else
@@ -2880,21 +2821,21 @@ EOF
 fi
 
 echo $ac_n "checking for inline""... $ac_c" 1>&6
-echo "configure:2884: checking for inline" >&5
+echo "configure:2825: checking for inline" >&5
 if eval "test \"`echo '$''{'ac_cv_c_inline'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   ac_cv_c_inline=no
 for ac_kw in inline __inline__ __inline; do
   cat > conftest.$ac_ext <<EOF
-#line 2891 "configure"
+#line 2832 "configure"
 #include "confdefs.h"
 
 int main() {
 } $ac_kw foo() {
 ; return 0; }
 EOF
-if { (eval echo configure:2898: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2839: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_inline=$ac_kw; break
 else
@@ -2920,7 +2861,7 @@ EOF
 esac
 
 echo $ac_n "checking size of short""... $ac_c" 1>&6
-echo "configure:2924: checking size of short" >&5
+echo "configure:2865: checking size of short" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_short'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2928,7 +2869,7 @@ else
   ac_cv_sizeof_short=2
 else
   cat > conftest.$ac_ext <<EOF
-#line 2932 "configure"
+#line 2873 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -2939,7 +2880,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:2943: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2884: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_short=`cat conftestval`
 else
@@ -2959,7 +2900,7 @@ EOF
 
 
 echo $ac_n "checking size of int""... $ac_c" 1>&6
-echo "configure:2963: checking size of int" >&5
+echo "configure:2904: checking size of int" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_int'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2967,7 +2908,7 @@ else
   ac_cv_sizeof_int=4
 else
   cat > conftest.$ac_ext <<EOF
-#line 2971 "configure"
+#line 2912 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -2978,7 +2919,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:2982: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2923: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_int=`cat conftestval`
 else
@@ -2998,7 +2939,7 @@ EOF
 
 
 echo $ac_n "checking size of long""... $ac_c" 1>&6
-echo "configure:3002: checking size of long" >&5
+echo "configure:2943: checking size of long" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_long'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3006,7 +2947,7 @@ else
   ac_cv_sizeof_long=4
 else
   cat > conftest.$ac_ext <<EOF
-#line 3010 "configure"
+#line 2951 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -3017,7 +2958,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:3021: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2962: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_long=`cat conftestval`
 else
@@ -3037,7 +2978,7 @@ EOF
 
 
 echo $ac_n "checking size of long long""... $ac_c" 1>&6
-echo "configure:3041: checking size of long long" >&5
+echo "configure:2982: checking size of long long" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_long_long'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3045,7 +2986,7 @@ else
   ac_cv_sizeof_long_long=8
 else
   cat > conftest.$ac_ext <<EOF
-#line 3049 "configure"
+#line 2990 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -3056,7 +2997,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:3060: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3001: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_long_long=`cat conftestval`
 else
@@ -3076,12 +3017,12 @@ EOF
 
 
 echo $ac_n "checking for off_t""... $ac_c" 1>&6
-echo "configure:3080: checking for off_t" >&5
+echo "configure:3021: checking for off_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_off_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3085 "configure"
+#line 3026 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -3109,12 +3050,12 @@ EOF
 fi
 
 echo $ac_n "checking for loff_t""... $ac_c" 1>&6
-echo "configure:3113: checking for loff_t" >&5
+echo "configure:3054: checking for loff_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_loff_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3118 "configure"
+#line 3059 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -3142,12 +3083,12 @@ EOF
 fi
 
 echo $ac_n "checking for size_t""... $ac_c" 1>&6
-echo "configure:3146: checking for size_t" >&5
+echo "configure:3087: checking for size_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_size_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3151 "configure"
+#line 3092 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -3175,12 +3116,12 @@ EOF
 fi
 
 echo $ac_n "checking whether time.h and sys/time.h may both be included""... $ac_c" 1>&6
-echo "configure:3179: checking whether time.h and sys/time.h may both be included" >&5
+echo "configure:3120: checking whether time.h and sys/time.h may both be included" >&5
 if eval "test \"`echo '$''{'ac_cv_header_time'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3184 "configure"
+#line 3125 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/time.h>
@@ -3189,7 +3130,7 @@ int main() {
 struct tm *tp;
 ; return 0; }
 EOF
-if { (eval echo configure:3193: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3134: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_header_time=yes
 else
@@ -3210,12 +3151,12 @@ EOF
 fi
 
 echo $ac_n "checking whether struct tm is in sys/time.h or time.h""... $ac_c" 1>&6
-echo "configure:3214: checking whether struct tm is in sys/time.h or time.h" >&5
+echo "configure:3155: checking whether struct tm is in sys/time.h or time.h" >&5
 if eval "test \"`echo '$''{'ac_cv_struct_tm'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3219 "configure"
+#line 3160 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <time.h>
@@ -3223,7 +3164,7 @@ int main() {
 struct tm *tp; tp->tm_sec;
 ; return 0; }
 EOF
-if { (eval echo configure:3227: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3168: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_tm=time.h
 else
@@ -3247,12 +3188,12 @@ fi
 for ac_func in strdup cfmakeraw
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3251: checking for $ac_func" >&5
+echo "configure:3192: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3256 "configure"
+#line 3197 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3275,7 +3216,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3279: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3220: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3302,12 +3243,12 @@ done
 for ac_func in nanosleep clock_gettime timer_create
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3306: checking for $ac_func" >&5
+echo "configure:3247: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3311 "configure"
+#line 3252 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3330,7 +3271,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3334: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3275: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3363,7 +3304,7 @@ if MACHINE=`uname -a 2>/dev/null`; then
     ;;
   FreeBSD*3.*)
         echo $ac_n "checking for cam_open_btl in -lcam""... $ac_c" 1>&6
-echo "configure:3367: checking for cam_open_btl in -lcam" >&5
+echo "configure:3308: checking for cam_open_btl in -lcam" >&5
 ac_lib_var=`echo cam'_'cam_open_btl | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -3371,7 +3312,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lcam  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3375 "configure"
+#line 3316 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3382,7 +3323,7 @@ int main() {
 cam_open_btl()
 ; return 0; }
 EOF
-if { (eval echo configure:3386: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3327: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -3408,17 +3349,17 @@ fi
     else
             ac_safe=`echo "/sys/cam/cam.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for /sys/cam/cam.h""... $ac_c" 1>&6
-echo "configure:3412: checking for /sys/cam/cam.h" >&5
+echo "configure:3353: checking for /sys/cam/cam.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3417 "configure"
+#line 3358 "configure"
 #include "confdefs.h"
 #include </sys/cam/cam.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:3422: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:3363: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -3451,7 +3392,7 @@ fi
     ;;
   FreeBSD*)
         echo $ac_n "checking for scsi_open in -lscsi""... $ac_c" 1>&6
-echo "configure:3455: checking for scsi_open in -lscsi" >&5
+echo "configure:3396: checking for scsi_open in -lscsi" >&5
 ac_lib_var=`echo scsi'_'scsi_open | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -3459,7 +3400,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lscsi  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3463 "configure"
+#line 3404 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3470,7 +3411,7 @@ int main() {
 scsi_open()
 ; return 0; }
 EOF
-if { (eval echo configure:3474: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3415: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -3496,17 +3437,17 @@ fi
     else
             ac_safe=`echo "scsi.h sys/scsiio.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for scsi.h sys/scsiio.h""... $ac_c" 1>&6
-echo "configure:3500: checking for scsi.h sys/scsiio.h" >&5
+echo "configure:3441: checking for scsi.h sys/scsiio.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3505 "configure"
+#line 3446 "configure"
 #include "confdefs.h"
 #include <scsi.h sys/scsiio.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:3510: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:3451: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -3560,9 +3501,9 @@ CPUSRCS="../uae_cpu/basilisk_glue.cpp ../uae_cpu/memory.cpp ../uae_cpu/newcpu.cp
 
 HAVE_I386=no
 echo $ac_n "checking for x86 target CPU""... $ac_c" 1>&6
-echo "configure:3564: checking for x86 target CPU" >&5
+echo "configure:3505: checking for x86 target CPU" >&5
 cat > conftest.$ac_ext <<EOF
-#line 3566 "configure"
+#line 3507 "configure"
 #include "confdefs.h"
 
 #ifdef __i386__
@@ -3583,7 +3524,7 @@ rm -f conftest*
 
 HAVE_GAS=no
 echo $ac_n "checking for GAS .p2align feature""... $ac_c" 1>&6
-echo "configure:3587: checking for GAS .p2align feature" >&5
+echo "configure:3528: checking for GAS .p2align feature" >&5
 cat >conftest.S << EOF
 	.text
 	.p2align 5
@@ -3593,9 +3534,9 @@ echo "$ac_t""$HAVE_GAS" 1>&6
 
 HAVE_GCC27=no
 echo $ac_n "checking for GCC 2.7 or higher""... $ac_c" 1>&6
-echo "configure:3597: checking for GCC 2.7 or higher" >&5
+echo "configure:3538: checking for GCC 2.7 or higher" >&5
 cat > conftest.$ac_ext <<EOF
-#line 3599 "configure"
+#line 3540 "configure"
 #include "confdefs.h"
 #if __GNUC__ - 1 > 1 || __GNUC_MINOR__ - 1 > 5
   yes
diff --git a/BasiliskII/src/Unix/configure.in b/BasiliskII/src/Unix/configure.in
index 19d0a9cb..cbad644c 100644
--- a/BasiliskII/src/Unix/configure.in
+++ b/BasiliskII/src/Unix/configure.in
@@ -77,13 +77,8 @@ AC_CHECK_FUNCS(sem_init)
 if [[ "x$ac_cv_func_sem_init" = "xno" ]]; then
   AC_CHECK_LIB(posix4, sem_init, HAVE_LIBPOSIX4=yes, HAVE_LIBPOSIX4=no)
   if [[ "x$HAVE_LIBPOSIX4" = "xno" ]]; then
-    dnl Checks for the existance of semget
-    AC_CHECK_FUNCS(semget)
-    if [[ "x$ac_cv_func_semget" = "xno" ]]; then
-      AC_MSG_ERROR([You need POSIX.4 semaphores to run Basilisk II.])
-    else
-      SEMSRCS="posix_sem.cpp"
-    fi
+    dnl Emulate semaphores with pthread mutexes
+    SEMSRCS="posix_sem.cpp"
   else
     LIBS="$LIBS -lposix4"
   fi