configure: Add _GNU_SOURCE flag to linux and debian presets to enable Linux fallocate()

diff --git a/configure b/configure
index dd6af49c35f70777fab532bbe98ea3148a7bb63b..209fdccb310465da4eb353b8804af2ed339c6aa7 100755 (executable)
--- a/configure
+++ b/configure
@@ -96,6 +96,7 @@ do
        LUA_SUFFIX_SET=yes
        LUA_INCDIR=/usr/include/lua5.1;
        LUA_INCDIR_SET=yes
+       CFLAGS="$CFLAGS -D_GNU_SOURCE"
        fi
        if [ "$OSTYPE" = "macosx" ]
        then LUA_INCDIR=/usr/local/include;
@@ -110,6 +111,7 @@ do
         LUA_LIBDIR=/usr/local/lib
         LUA_LIBDIR_SET=yes
         CFLAGS="-Wall -fPIC"
+        CFLAGS="$CFLAGS -D_GNU_SOURCE"
         LDFLAGS="-shared"
         fi
         if [ "$OSTYPE" = "freebsd" -o "$OSTYPE" = "openbsd" ]