[UDUNITS #KER-143836]: Env. Var. for the UDUNITS2 lib path_

Daniel,

> I writing a minor update for the configure script of NCO (see
> https://sourceforge.net/p/nco/bugs/96/). Do there exist default
> environment variable names for variables pointing to the UDUNITS2
> library path and include path?

No. The UDUNITS package doesn't set any environment variables for use outside
the package build process.

> If not, should a user use UDUNITS2_LIB or
> UDUNITS_LIB (and *_INC, respectively)? Or the other way around: should
> the configure script look into UDUNITS2_LIB or UDUNITS_LIB?

I would modify the file "configure.ac" in the NCO package to use the
autoconf(1) macros AC_SEARCH_LIBS and AC_CHECK_HEADER to check for the
installed UDUNITS files. For example:

    AC_CHECK_HEADER([udunits2.h], ,
        [AC_MSG_ERROR([UDUNITS2 header-file not found])])
    AC_SEARCH_LIBS([ut_parse], [udunits2], ,
        [AC_MSG_ERROR([UDUNITS2 library not found])])

This will ensure that the user has set the configure(1) variables CPPFLAGS
and LIBS correctly when configuring the build for the NCO package. For
example:

    ./configure CPPFLAGS='-I /opt/udunits2/include' LIBS='-L /opt/udunits2/lib' 
...

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: KER-143836
Department: Support UDUNITS
Priority: Normal
Status: Closed
===================
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