diff -u ecl-0.9i/src/aclocal.m4 ecl-0.9i/src/aclocal.m4
--- ecl-0.9i/src/aclocal.m4
+++ ecl-0.9i/src/aclocal.m4
@@ -198,0 +199,10 @@
+	kfreebsd*-gnu)
+		thehost='kfreebsd'
+		THREAD_CFLAGS='-D_THREAD_SAFE'
+		THREAD_LIBS='-lpthread'
+		SHARED_LDFLAGS="-shared ${LDFLAGS}"
+		BUNDLE_LDFLAGS="-shared ${LDFLAGS}"
+		LDRPATH='-Wl,--rpath,/usr/lib/ecl/'
+		clibs="-ldl"
+		# Maybe CFLAGS="-D_ISOC99_SOURCE ${CFLAGS}" ???
+		;;