Build on cygwin (#80)
diff --git a/Makefile.am b/Makefile.am
index 9585a15..206457e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -13,7 +13,7 @@ noinst_HEADERS = include/common.h \
lib_LTLIBRARIES = libbzip3.la
libbzip3_la_SOURCES = src/libbz3.c
-libbzip3_la_LDFLAGS = -version-info 0:0:0
+libbzip3_la_LDFLAGS = -no-undefined -version-info 0:0:0
bin_PROGRAMS = bzip3
bzip3_CFLAGS = $(AM_CFLAGS)
