[PATCH] erofs-utils: fix configure.ac

[Haruue Icymoon]

./configure will fail when --with-lz4-libdir is not set, since
$with_lz4_libdir will be an empty string and generate an empty -L
into LDFLAGS. This patch fixes it.

Signed-off-by: Haruue Icymoon <i at haruue.moe>
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index f925358..870dfb9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -174,7 +174,7 @@ if test "x$enable_lz4" = "xyes"; then
 
   if test "x${have_lz4h}" = "xyes" ; then
     saved_LDFLAGS=${LDFLAGS}
-    LDFLAGS="-L$with_lz4_libdir ${LDFLAGS}"
+    test -z "${with_lz4_libdir}" || LDFLAGS="-L$with_lz4_libdir ${LDFLAGS}"
     AC_CHECK_LIB(lz4, LZ4_compress_destSize, [
       have_lz4="yes"
       have_lz4hc="yes"
-- 
2.24.0


-- 
Haruue Icymoon
GPG: E16D 3FA4 E636 A602 2684  0D38 A54A 7E9C 812E EB09
https://haruue.moe/