--- gforth/configure.in	1995/11/29 20:20:33	1.14
+++ gforth/configure.in	1995/12/15 01:54:09	1.16
@@ -1,15 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.
-
 AC_INIT(engine.c)
 
-GCC=${GCC-gcc}
-AC_SUBST(GCC)
-
-dnl configure needs $CC to find out some parameters, and there may be
-dnl differences in what is obtained from gcc and from the default cc.
-dnl Therefore, we define $CC to be gcc:
-CC=$GCC
-
 AC_ARG_ENABLE(force-reg,
 [  --enable-force-reg	  Use explicit register declarations if they appear in
 			  the machine.h file. This can cause a good speedup,
@@ -36,7 +27,23 @@ AC_ARG_WITH(debug,
                     debugging informations.],
 if test "$withval" = "yes"; then DEBUGFLAG=-g; fi)
 
+CFLAGS=$CFLAGS
 
+AC_PROG_CC
+
+if test "$GCC" = "yes"
+then
+   echo "Fine, gcc is available"
+else
+   cat <<'EOF'
+Gforth requires GCC-2.0 or higher (it uses GNU C extensions).
+It does not work with other C compilers. Please install the GNU C compiler,
+and try again (or search for a binary distribution for your platform).
+EOF
+   exit 1
+fi
+
+AC_SUBST(CC)
 AC_SUBST(GCCLDFLAGS)
 AC_SUBST(DEBUGFLAG)
 
@@ -54,7 +61,7 @@ case "$ac_cv_sizeof_char_p" in
 dnl    AC_CHECK_SIZEOF(long long)
 dnl    if [ $ac_cv_sizeof_long_long != 16 ]
 dnl    then
-dnl       try the whole thing with -mlonlong128
+dnl       try the whole thing with -mlonglong128
 dnl complain about C compiler and OS vendor
 dnl    fi
     ;;
@@ -75,13 +82,10 @@ case "$host_cpu" in
 		;;
 	i386|i486|i586)
 		mach_h=386
-		CFLAGS="-fforce-mem -fforce-addr -fomit-frame-pointer"
+		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"
 		#!! direct/indirect threading switch
 		#!! -m486 flag
 		;;
-	m68*)
-		mach_h=m68k
-		;;
 	mips*)
 		mach_h=mips
 		#link text and data segment into the same 256M region!
@@ -93,13 +97,15 @@ case "$host_cpu" in
 		;;
 	*)
 		echo "No direct threading support for $host_cpu, using indirect threading."
-		echo "Using a generic 32-bit machine description. It will only work if char * AND"
-		echo "long values have 32 bits."
+		echo "Using a generic machine description. It will only work if char * AND"
+		echo "long values have the same size and long long is twice as long."
 		echo "I'll assume that C floats and doubles are represented by IEEE single and"
 		echo "double numbers. If this is not so, SF@ etc. will not work correctly."
+		echo "FLUSH-ICACHE will do nothing, so END-CODE may not work properly!"
 		mach_h=32bit
 esac
 AC_SUBST(host)
+AC_SUBST(ENGINE_FLAGS)
 
 dnl Now a little support for DOS/DJGCC
 AC_SUBST(MAKE_EXE)