diff --git a/crc/.gitignore b/crc/.gitignore
new file mode 100644
index 0000000..6d63654
--- /dev/null
+++ b/crc/.gitignore
@@ -0,0 +1,8 @@
+arc.c
+binhex.c
+ccitt.c
+ccitt32.c
+kermit.c
+libcrc.a
+makecrc
+zip.c
diff --git a/crc/makecrc.c b/crc/makecrc.c
index a1ca573..d65f073 100644
--- a/crc/makecrc.c
+++ b/crc/makecrc.c
@@ -109,10 +109,7 @@ int poly, init, swapped, bits;
     }
     (void)fprintf(fd, "};\n");
     (void)fprintf(fd, "\n");
-    (void)fprintf(fd, "unsigned long %s_updcrc(icrc, icp, icnt)\n", name);
-    (void)fprintf(fd, "    unsigned long icrc;\n");
-    (void)fprintf(fd, "    unsigned char *icp;\n");
-    (void)fprintf(fd, "    int icnt;\n");
+    (void)fprintf(fd, "unsigned long %s_updcrc(unsigned long icrc, unsigned char *icp, int icnt)\n", name);
     (void)fprintf(fd, "{\n");
     if(bits == 16) {
 	(void)fprintf(fd, "#define M1 0xff\n");
diff --git a/macunpack/crc.h b/macunpack/crc.h
index b339d36..bcbd2bc 100644
--- a/macunpack/crc.h
+++ b/macunpack/crc.h
@@ -4,9 +4,9 @@ extern unsigned long arc_crcinit;
 extern unsigned long binhex_crcinit;
 extern unsigned long zip_crcinit;
 
-extern unsigned long arc_updcrc();
-extern unsigned long binhex_updcrc();
-extern unsigned long zip_updcrc();
+extern unsigned long arc_updcrc(unsigned long icrc, unsigned char *icp, int icnt);
+extern unsigned long binhex_updcrc(unsigned long icrc, unsigned char *icp, int icnt);
+extern unsigned long zip_updcrc(unsigned long icrc, unsigned char *icp, int icnt);
 
 extern unsigned long crcinit;
 extern unsigned long (*updcrc)();