reproducible build for paths embedded in shipped files Looking up the full path of tools from PATH at build-time and injecting them in files shipped in the package might lead to unexpected paths being embedded when building in an unclean local environment.
To avoid this problem, this patch gives the explicit paths to the tools to make the build reproducible.
Unfortunately only tclsh is overrideable via --with-tclsh= from configure command line but no the rest, so we opt for patching the configure file instead.
This patch also makes sure that the specified variables (PS and BASENAME) actually gets used in the check_requirement call.
