diff --git a/BasiliskII/src/Unix/configure.ac b/BasiliskII/src/Unix/configure.ac
index d1f90841..8b360a38 100755
--- a/BasiliskII/src/Unix/configure.ac
+++ b/BasiliskII/src/Unix/configure.ac
@@ -36,6 +36,7 @@ AC_ARG_ENABLE(sdl-video,     [  --enable-sdl-video      use SDL for video graphi
 AC_ARG_ENABLE(sdl-audio,     [  --enable-sdl-audio      use SDL for audio [default=no]], [WANT_SDL_AUDIO=$enableval], [WANT_SDL_AUDIO=no])
 AC_ARG_ENABLE(sdl-framework,    [  --enable-sdl-framework  use SDL framework [default=no]], [WANT_SDL_FRAMEWORK=$enableval], [WANT_SDL_FRAMEWORK=no])
 AC_ARG_ENABLE(sdl-framework-prefix,    [  --enable-sdl-framework-prefix=PFX    default=/Library/Frameworks], [SDL_FRAMEWORK="$enableval"], [SDL_FRAMEWORK=/Library/Frameworks])
+AC_ARG_WITH(sdl1,            [  --with-sdl1             use SDL 1.x, rather than SDL 2.x [default=no]], [WANT_SDL_VERSION_MAJOR=1], [])
 
 dnl JIT compiler options.
 AC_ARG_ENABLE(jit-compiler,  [  --enable-jit-compiler   enable JIT compiler [default=no]], [WANT_JIT=$enableval], [WANT_JIT=no])
@@ -300,7 +301,16 @@ if [[ "x$WANT_SDL" = "xyes" ]]; then
     ac_cv_framework_SDL=no
   fi
   if [[ "x$ac_cv_framework_SDL" = "xno" ]]; then
-    WANT_SDL_VERSION_MAJOR=2
+    dnl use PKG_PROG_PKG_CONFIG to declare PKG_CONFIG variables.  Otherwise,
+    dnl PKG_* macros may fail, without much explanation.  The lack of this
+    dnl was causing --with-sdl1 to fail, as SDL 1.x could not be detected,
+    dnl as the 2nd call to PKG_CHECK_MODULES would fail, as $PKG_CONFIG
+    dnl never got defined (bizarrely-enough).  -- dludwig@pobox.com
+    PKG_PROG_PKG_CONFIG
+
+    if [[ "x$WANT_SDL_VERSION_MAJOR" = "x" ]]; then
+      WANT_SDL_VERSION_MAJOR=2
+    fi
     if [[ "x$WANT_SDL_VERSION_MAJOR" = "x2" ]]; then
       PKG_CHECK_MODULES([sdl2], [sdl2 >= 2.0], [
         CFLAGS="$CFLAGS $sdl2_CFLAGS"
@@ -1849,6 +1859,7 @@ echo
 echo Mac OS X GUI ........................... : $WANT_MACOSX_GUI
 echo Mac OS X Sound ......................... : $WANT_MACOSX_SOUND
 echo SDL support ............................ : $SDL_SUPPORT
+echo SDL major-version ...................... : $WANT_SDL_VERSION_MAJOR
 echo BINCUE support ......................... : $have_bincue
 echo LIBVHD support ......................... : $have_libvhd
 echo XFree86 DGA support .................... : $WANT_XF86_DGA