Index: fltk-config.in
===================================================================
--- fltk-config.in	(revision 4778)
+++ fltk-config.in	(working copy)
@@ -53,8 +53,8 @@
 POSTBUILD="@POSTBUILD@"
 
 # flags for C++ compiler:
-CFLAGS="@CFLAGS@"
-CXXFLAGS="@CXXFLAGS@"
+CFLAGS="@CFLAGS@ @LARGEFILE@"
+CXXFLAGS="@CXXFLAGS@ @LARGEFILE@"
 LDFLAGS="@LDFLAGS@"
 LDLIBS="@LIBS@"
 
Index: configure.in
===================================================================
--- configure.in	(revision 4778)
+++ configure.in	(working copy)
@@ -392,7 +392,7 @@
 
 dnl Define largefile options as needed...
 LARGEFILE=""
-if test x$enable_largefile != xno; then
+if test x$enable_largefile = xyes; then
 	LARGEFILE="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE"
 
 	if test $ac_cv_sys_large_files = 1; then