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Thomas Miedema authored
`configure` currently detects when the docbook and hscolour tools aren't available, and instead of failing outright (as it does for missing alex and happy), sets some variables in mk/config.mk to tell `make` not to build the documentation. Sometimes, however, you want to really make sure all documentation gets built, fully colourized. For example when making a release. To do so, you can override the mentioned variables from mk/config.mk in mk/build.mk (e.g. set HSCOLOUR_SRCS=YES). This patch adds some error checking to make sure that doing so will not result in weird build failures when those tools are still missing. Test Plan: ran `make` a couple of times, with different mk/config.mk settings. Reviewed by: austin Differential Revision: https://phabricator.haskell.org/D1232
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