meson: generate the libratbag.pc file through configure_file

pkgconfig.generate() does not (yet) have a parameter for setting custom
variables - we need that for pkgdatadir to point to the SVG files. Swap to
using configure_file with the old .pc.in file that was forgotten in the tree
anyway.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

meson.build

@@ -172,12 +172,18 @@ dep_libratbag = declare_dependency(
 	dependencies : deps_libratbag
 )
 
-pkgconfig.generate(
-        filebase: 'libratbag',
-        name: 'Libratbag',
-        description: 'Mouse configuration library',
-        version: meson.project_version(),
-        libraries: lib_libratbag
+pkgconfigdata = configuration_data()
+pkgconfigdata.set('prefix', get_option('prefix'))
+pkgconfigdata.set('libdir', get_option('libdir'))
+pkgconfigdata.set('datadir', get_option('datadir'))
+pkgconfigdata.set('includedir', get_option('includedir'))
+pkgconfigdata.set('LIBRATBAG_VERSION', meson.project_version())
+pkgconfigfile = configure_file(
+	input : 'src/libratbag.pc.in',
+	output : 'libratbag.pc',
+	configuration : pkgconfigdata,
+	install : true,
+	install_dir : get_option('libdir') + '/pkgconfig'
 )
 
 #### libshared.a ####

src/libratbag.pc.in

@@ -1,9 +1,8 @@
 prefix=@prefix@
-exec_prefix=@exec_prefix@
-datarootdir=@datarootdir@
-pkgdatadir=@datadir@/@PACKAGE@
-libdir=@libdir@
-includedir=@includedir@
+datadir=${prefix}/@datadir@
+pkgdatadir=${datadir}/libratbag
+libdir=${prefix}/@libdir@
+includedir=${prefix}/@includedir@
 
 Name: Libratbag
 Description: Mouse configuration library