Re: [help-gnuastro] GNU Astro configure error - missing WCSLIB component

[Mohammad Akhlaghi]

Great!

I am happy we fixed the linker flags. To tell the compiler where to look 
for the headers, we have to use the `CPPFLAGS' environment variable.

So the solution is to run this command:

./configure --prefix=/packages/gnuastro/0.5 
CPPFLAGS=-I/packages/wcslib/5.18/include LDFLAGS=-L/packages/wcslib/5.18/lib

The Configure script's `--includedir' is for the output/installed header 
files, not the input.

In other words, with `--includedir=/packages/wcslib/5.18/include', you 
are telling the build system to put Gnuastro library's headers in the 
same place as WCSLIB's headers 
(`--includedir=/packages/wcslib/5.18/include'), while everything else 
will be installed in `/packages/gnuastro/0.5'.

The configure command above should fix the problem. If so, please let us 
know.

To avoid such problems in the future (and use a simple `./configure 
--prefix=PPPPP') you can set the LDFLAGS and CPPFLAGS similar to how you 
set the PATH and LD_LIBRARY_PATH variables (to look into each program's 
specific version locations).

In the mean time, it would also help your users if MANPATH and INFOPATH 
also point to the same versions of the software that PATH points to. In 
this way, when people run any of the two commands below, they will get 
the man page and Info documentation of the version corresponding to the 
executable (in this case, NoiseChisel's executable, which is one of 
Gnuastro's programs).

$ man astnoisechisel
$ info astnoisechisel

These are summarized in the box at the end of this page:

https://www.gnu.org/software/gnuastro/manual/html_node/Installation-directory.html

Cheers,
Mohammad