--- flex-2.6.4/src/Makefile.in.orig	Thu Jan 23 22:45:32 2020
+++ flex-2.6.4/src/Makefile.in	Thu Jan 23 22:46:15 2020
@@ -342,7 +342,7 @@
 LIBINTL = @LIBINTL@
 LIBOBJS = @LIBOBJS@
 LIBPTHREAD = @LIBPTHREAD@
-LIBS = @LIBS@
+LIBS = @LIBS@ -lpcre2-posix -lpcre2-8
 LIBTOOL = @LIBTOOL@
 LIPO = @LIPO@
 LN_S = @LN_S@