Needed to link libfl.a into shared libraries
--- Makefile.am
+++ Makefile.am
@@ -73,6 +73,8 @@
 	libmain.c \
 	libyywrap.c
 
+libfl_a_CFLAGS = -fPIC
+
 noinst_HEADERS = \
 	flexdef.h \
 	flexint.h \