Allow setting GHCFLAGS with configure.

src/Makefile

@@ -3,7 +3,7 @@ include config.mk
 
 GHMAKE=$(GHC) --make
 GHCXMAKE=ghcxmake
-GHCFLAGS= -fglasgow-exts -package util
+GHCFLAGS+= -fglasgow-exts -package util
 GHCOPTFLAGS=-O2
 GHCFUDFLAG=
 JAVAFLAGS=-target 1.4 -source 1.4
@@ -21,8 +21,8 @@ GRAMMAR_DIST_DIR=GF-grammars-$(PACKAGE_VERSION)
 
 SNAPSHOT_DIR=GF-$(shell date +%Y%m%d)
 
-# use the temporary binary file name 'gf-bin' name to not clash with directory 'GF' 
-# on case insensitive file systems (such as MacOSX)
+# use the temporary binary file name 'gf-bin' to not clash with directory 'GF' 
+# on case insensitive file systems (such as FAT)
 GF_EXE=gf$(EXEEXT)
 GF_EXE_TMP=gf-bin$(EXEEXT)
 GF_DOC_EXE=gfdoc$(EXEEXT)

src/config.mk.in

@@ -11,6 +11,7 @@ datadir = @datadir@
 
 host = @host@
 
+GHCFLAGS = @GHCFLAGS@
 CPPFLAGS = @CPPFLAGS@
 LDFLAGS = @LDFLAGS@
 

src/configure.ac

@@ -4,7 +4,7 @@ AC_INIT([GF],[2.2],[aarne@cs.chalmers.se],[GF])
 
 AC_PREREQ(2.53)
 
-AC_REVISION($Revision: 1.18 $)
+AC_REVISION($Revision: 1.19 $)
 
 AC_CONFIG_FILES([config.mk jgf])
 
@@ -130,6 +130,7 @@ dnl ***********************************************
 dnl Program flags
 dnl ***********************************************
 
+AC_SUBST(GHCFLAGS)
 AC_SUBST(CPPFLAGS)
 AC_SUBST(LDFLAGS)