make release install error on Linux

[blakemcbride]

$ sudo make release install
[...]
for d in help macros macros/demos macros/kbd macros/tty src src/demos src/kbd src/tty; do \
		mkdir -p /usr/local/share/gr/${d}; \
	done
/usr/bin/install -c -m 0755  /home/blake/Backup/grief.git/bin.gcc/release/gr.exe /usr/local/bin
/usr/bin/install: cannot stat '/home/blake/Backup/grief.git/bin.gcc/release/gr.exe': No such file or directory
make[1]: *** [Makefile:519: install] Error 1
make[1]: Leaving directory '/home/blake/Backup/grief.git'
make: *** [Makefile:152: release] Error 2
$

Notice the .exe file extension.

[blakemcbride]

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