AC_SUBST([LIBCRYPTO_CFLAGS], [$LIBCRYPTO_CFLAGS])
AC_SUBST([SHA1_SOURCES], [$SHA1_SOURCES])
+case "$host" in
+ *-*-cygwin*)
+ dnl -no-undefined is needed to build a DLL in a Cygwin environment.
+ CYGWIN_EXTRA_LDFLAGS="-no-undefined"
+
+ dnl -fvisibility=hidden should not be used in a Cygwin
+ dnl environment
+ VISIBILITY_CFLAGS=""
+ ;;
+ *)
+ CYGWIN_EXTRA_LDFLAGS=""
+ VISIBILITY_CFLAGS="-fvisibility=hidden"
+ ;;
+esac
+
+AC_SUBST([CYGWIN_EXTRA_LDFLAGS], [$CYGWIN_EXTRA_LDFLAGS])
+AC_SUBST([VISIBILITY_CFLAGS], [$VISIBILITY_CFLAGS])
+
AC_OUTPUT