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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index 465f5b73..038ea7f8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -152,7 +152,7 @@ AS_IF([test "x$enable_cairo" != "xno"],
CFLAGS="$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"