Dependencies used in myMPD

[comburent]

Hi,

While building myMPD, I've noticed the following lines:

-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE  
-- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) 
-- Found PCRE2: /gnu/store/i7f40vxcp8gi05pzcf75s3hvv8m2gv0i-pcre2-10.40/lib/libpcre2-8.so
Searching for openssl
-- Found OpenSSL: /gnu/store/69wd3pd1hd3j84xr965jj2fk2qmxn0hl-openssl-3.0.8/lib/libcrypto.so (found version "3.0.8")  
Searching for libid3tag
-- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) 
-- Found LIBID3TAG: /gnu/store/biykph2rp6k1qygdmxsg02dqy12pv29n-libid3tag-0.15.1b/lib/libid3tag.so  
Searching for flac
-- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) 
-- Found FLAC: /gnu/store/1ywm8hnpc1mvw3ig0mv6xqjvl1bqprl4-flac-1.3.4/lib/libFLAC.so
…

Even with pkg-config missing, myMPD was still able to be built without problems which leaves me wondering:

• What is pkg-config used for? Is it safe to leave it out?

[jcorporation]

PkgConfig is used to find some libraries. This process falls back to traditional methods if PkgConfig is not found, it is not a hard dependency.