gentoo-overlay/dev-db/pgpool2/files/pgpool-configure-pthread.patch

--- a/configure.ac
+++ b/configure.ac
@@ -3,6 +3,10 @@
 
 dnl Checks for programs.
 AC_PROG_CC
+AX_PTHREAD
+LIBS="$PTHREAD_LIBS $LIBS"
+CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+CC="$PTHREAD_CC"
 
 AM_INIT_AUTOMAKE([foreign no-dependencies subdir-objects])