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-rw-r--r--Makefile14
1 files changed, 14 insertions, 0 deletions
diff --git a/Makefile b/Makefile
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--- /dev/null
+++ b/Makefile
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+# The Netpbm make files exploit features of GNU Make that other Makes
+# do not have.  Because it is a common mistake for users to try to build
+# Netpbm with a different Make, we have this make file that does nothing
+# but tell the user to use GNU Make.
+
+# If the user were using GNU Make now, this file would not get used because
+# GNU Make uses a make file named "GNUmakefile" in preference to "Makefile"
+# if it exists.  Netpbm is shipped with a "GNUmakefile".
+
+all merge install clean dep:
+	@echo "You must use GNU Make to build Netpbm.  You are running some "
+	@echo "other Make.  GNU Make may be installed on your system with "
+	@echo "the name 'gmake'.  If not, see http://www.gnu.org/software ."
+	@echo