Hey Patrick, Congrats on 2.5.90!
> ./configure && make && make check > Works for me on Ubuntu 18.04 x86_64, additionally trying a VPATH build, using -j for parallelism, and running 'make -j install' for a non-standard prefix. cd doc ; make html 'make html' works in a regular build. I've not looked at the Sphinx docs before. They're pretty. Does not work from a VPATH build (i.e. unpack GSL sources, run autogen.sh, create a wholly separate directory, then run GSL's configure from inside that separate directory). In particular, with messages... make[1]: Leaving directory '/home/rhys/Build/gsl-gcc/doc/examples' Error: Config directory doesn't contain a conf.py file. VPATH building of documentation is an edge case. Likely not worth pursuing a fix at all and certainly not worth holding up 2.6. I just tried it because I tend to use VPATH for autoconfiscated projects. - Rhys