1 files changed, 1 insertions, 1 deletions
diff --git a/configure b/configure
index 80059d8b..1634de9a 100755
--- a/configure
+++ b/configure
@@ -5815,7 +5815,7 @@ fi
 
 
 CFLAGS="$CFLAGS $HDF5_CFLAGS $GTK_CFLAGS $GSL_CFLAGS $OPENCL_CFLAGS -pthread"
-CFLAGS="$CFLAGS $LIBTIFF_CFLAGS"
+CFLAGS="$CFLAGS $LIBTIFF_CFLAGS -D_GNU_SOURCE"
 LIBS="$LIBS $HDF5_LIBS -lm -lz $GSL_LIBS $GTK_LIBS $OPENCL_LIBS -pthread"
 LIBS="$LIBS $LIBTIFF_LIBS"