Initial commit

cmake/Modules/MinetestFindIrrlichtHeaders.cmake

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+# Locate IrrlichtMt headers on system.
+
+find_path(IRRLICHT_INCLUDE_DIR NAMES irrlicht.h
+	DOC "Path to the directory with IrrlichtMt includes"
+	PATHS
+	/usr/local/include/irrlichtmt
+	/usr/include/irrlichtmt
+	/system/develop/headers/irrlichtmt #Haiku
+	PATH_SUFFIXES "include/irrlichtmt"
+)
+
+# Handholding for users
+if(IRRLICHT_INCLUDE_DIR AND (NOT IS_DIRECTORY "${IRRLICHT_INCLUDE_DIR}" OR
+	NOT EXISTS "${IRRLICHT_INCLUDE_DIR}/irrlicht.h"))
+	message(WARNING "IRRLICHT_INCLUDE_DIR was set to ${IRRLICHT_INCLUDE_DIR} "
+		"but irrlicht.h does not exist inside. The path will not be used.")
+	unset(IRRLICHT_INCLUDE_DIR CACHE)
+endif()