/usr/bin/gs_make is in gnustep-make 2.6.2-2.1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
# helper script for building GNUstep projects
# sets up the GNUstep environment variables, and then calls make
GNUSTEP_MAKEFILES=/usr/share/GNUstep/Makefiles make "$@"
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