--- a/configure
+++ b/configure
@@ -16445,7 +16445,7 @@
 
 
 # Remove redundant occurrances of -lpq
-LIBS="`echo "$LIBS" | sed -e 's/-lpq[:space:]*[:space:]-lpq\>/-lpq/g'`"
+LIBS="`echo "$LIBS" | sed -e 's/-lpq * -lpq\>/-lpq/g'`"
 
 ac_ext=cpp
 ac_cpp='$CXXCPP $CPPFLAGS'