For example:
@example
+@c I have changed some of the comments here slightly to fix an overfull
+@c hbox, so the make manual can format correctly. --roland
# Common prefix for installation directories.
# NOTE: This directory must exist when you start the install.
prefix = /usr/local
exec_prefix = $(prefix)
-# Directory in which to put the executable for the command `gcc'.
+# Where to put the executable for the command `gcc'.
bindir = $(exec_prefix)/bin
-# Directory in which to put the directories used by the compiler.
+# Where to put the directories used by the compiler.
libdir = $(exec_prefix)/lib
-# Directory in which to put the Info files.
+# Where to put the Info files.
infodir = $(prefix)/info
@end example