Use quotation marks in case PCRE_LIBS is empty in configure.ac

diff --git a/configure.ac b/configure.ac
index 5beda895aea3345bfbdedad42f00a2b363878cbf..c3e4f76a53232667737b0bd99071b2625a17e181 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -425,7 +425,7 @@ fi
 
 ### Output
 
-if test ${PCRE_LIBS+set} = set; then
+if test "${PCRE_LIBS+set}" = set; then
    which_pcre="System"
 else
    which_pcre="Local (Consider getting your sysadmin to install pcre)"