Use configure to produce a gfc script with the correct path to gf3. NOTE: you need to re-run autoconf after pulling this patch.

bin/gfc

@@ -1,3 +0,0 @@
-#!/bin/sh
-GFBIN=/usr/local/bin/gf3
-exec $GFBIN --batch ${1+"$@"}

src/Makefile

@@ -194,6 +194,8 @@ tools/$(GF_DOC_EXE): tools/GFDoc.hs
 	$(GHMAKE) $(GHCOPTFLAGS) -o $@ $^
 
 gfc: gf3
+	cp -f gfc ../bin/
+	chmod a+x ../bin/gfc
 
 gfi: gf3
 

src/configure.ac

@@ -6,7 +6,7 @@ AC_PREREQ(2.53)
 
 AC_REVISION($Revision: 1.26 $)
 
-AC_CONFIG_FILES([config.mk jgf gfeditor])
+AC_CONFIG_FILES([config.mk gfc jgf gfeditor])
 
 AC_CANONICAL_HOST
 

src/gfc.in

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+prefix="@prefix@"
+
+case "@host@" in
+      *-cygwin)
+          prefix=`cygpath -w "$prefix"`;;
+esac
+
+exec_prefix="@exec_prefix@"
+GF_BIN_DIR="@bindir@"
+GF_DATA_DIR="@datadir@/GF-@PACKAGE_VERSION@"
+
+GFBIN="$GF_BIN_DIR/gf3"
+
+if [ ! -x "${GFBIN}" ]; then
+   GFBIN=`which gf3`
+fi
+
+if [ ! -x "${GFBIN}" ]; then
+    echo "gf3 not found."
+    exit 1
+fi
+
+exec $GFBIN --batch "$@"