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Where is the RTC documentation on gnu make
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You suppose you are actually asking for information about Ant Build.
https://jazz.net/library/article/1286
https://jazz.net/help-dev/clm/topic/com.ibm.team.build.doc/topics/r_ant-tasks.html
I have found no direct reference to GNU Make within RTC. If you are indeed after GNU Make, then you can find most information on the official site.
https://www.gnu.org/software/make/
https://jazz.net/library/article/1286
https://jazz.net/help-dev/clm/topic/com.ibm.team.build.doc/topics/r_ant-tasks.html
I have found no direct reference to GNU Make within RTC. If you are indeed after GNU Make, then you can find most information on the official site.
https://www.gnu.org/software/make/