Let -Dlibexecdir take preference

Adjust protocoldir accordingly when it is passed.

Author: bl33pbl0p

meson.build

@@ -97,7 +97,13 @@ prefixdir = get_option('prefix')
 bindir = join_paths(prefixdir, get_option('bindir'))
 datadir = join_paths(prefixdir, get_option('datadir'))
 docdir = join_paths(datadir, 'doc/casync')
-protocoldir = join_paths(prefixdir, 'lib/casync/protocols')
+
+if get_option('libexecdir')
+        libexecdir = join_paths(prefixdir, get_option('libexecdir'))
+        protocoldir = join_paths(libexecdir, 'casync/protocols')
+else
+        protocoldir = join_paths(prefixdir, 'casync/protocols')
+
 conf.set_quoted('CASYNC_PROTOCOL_PATH', protocoldir)
 
 liblzma = dependency('liblzma',