media-gfx/graphicsmagick/files/graphicsmagick-1.3.42-autoconf-2.72-perl-lfs.patch


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https://bugs.gentoo.org/920788
https://github.com/ImageMagick/ImageMagick/pull/6978
--- a/configure.ac
+++ b/configure.ac
@@ -386,7 +386,7 @@ AC_FUNC_FSEEKO
 LFS_CPPFLAGS=''
 if test "$enable_largefile" != no
 then
-  if test "$ac_cv_sys_file_offset_bits" != 'no'
+  if test "$ac_cv_sys_file_offset_bits" != 'no' && test -n "$ac_cv_sys_file_offset_bits"
   then
     LFS_CPPFLAGS="$LFS_CPPFLAGS -D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits"
   fi