Improve internal doc for Makefile.

diff --git a/gpsbabel/Makefile.in b/gpsbabel/Makefile.in
index 1c8df289a520a4c3a3f4e53feb85b3b34301785f..266bb20c399a22fc5b4b412a37355b343ef1e981 100644 (file)
--- a/gpsbabel/Makefile.in
+++ b/gpsbabel/Makefile.in
@@ -1,3 +1,11 @@
+#
+# Build file  for GPSBabel.
+# Makefile is generated from Makefile.in by autoconf which does several
+# text substitutions such version numbers and object paths for us.
+#
+# We rely on very few fancy features of make so the exact version probably
+# doesn't much matter.  GNU Make 3.81 seems a reasonable target.
+
 srcdir = @srcdir@
 VPATH = @srcdir@