diff --git a/packages/csharp-mono.mk b/packages/csharp-mono.mk
new file mode 100644
index 0000000..b9d7f54
--- /dev/null
+++ b/packages/csharp-mono.mk
@@ -0,0 +1,34 @@
+NAME=csharp-mono
+AUTHOR=Thomas Hobson <thomas@hexf.me>
+DEPENDENCIES=
+COMPILED=true
+VERSIONS=6.12.0
+
+include common.mk
+
+
+VERSION_6.12.0_FULL=6.12.0.122
+
+VERSION_FULL=${VERSION_${VERSION}_FULL}
+
+
+${RUN_FILE}:
+	echo 'CODE=$${1/cs/exe}' > $@
+	echo 'shift' >> $@
+	echo 'mono $$CODE $$*' >> $@
+
+${COMPILE_FILE}:
+	echo 'csc $$*' > $@
+
+${ENV_FILE}:
+	echo 'export PATH=$$PWD/bin:$$PATH' > $@
+
+${BIN_DIR}: ${BUILD_DIR}mono-${VERSION_FULL}/
+	$(eval TMP_DIR=${PWD}/${BUILD_DIR}tmpout/)
+	cd $< && ./configure --prefix ${PREFIX}
+	$(MAKE) -j64 -C $<
+	DESTDIR=${TMP_DIR} $(MAKE) -C $< install
+	mv ${TMP_DIR}${PREFIX} ${BIN_DIR} && rm -r ${TMP_DIR}
+
+${BUILD_DIR}mono-${VERSION_FULL}.tar.xz: 
+	curl "https://download.mono-project.com/sources/mono/mono-${VERSION_FULL}.tar.xz" -o $@