--- OpenNI-OpenNI-1e9524f/Platform/Linux/Build/Common/CommonCSMakefile.orig	2013-11-12 17:30:03.000000000 +0100
+++ OpenNI-OpenNI-1e9524f/Platform/Linux/Build/Common/CommonCSMakefile	2017-11-29 16:54:33.678880973 +0100
@@ -45,7 +45,7 @@
 	TARGET = winexe
 endif
 
-OUTPUT_COMMAND = gmcs -out:$(OUTPUT_FILE) -target:$(TARGET) $(CSFLAGS) $(USED_NETLIBS_OPTION) $(SRC_FILES)
+OUTPUT_COMMAND = mcs -out:$(OUTPUT_FILE) -target:$(TARGET) $(CSFLAGS) $(USED_NETLIBS_OPTION) $(SRC_FILES)
 
 #############################################################################
 # Targets