--- a/mesonbuild/modules/pkgconfig.py
+++ b/mesonbuild/modules/pkgconfig.py
@@ -702,15 +702,8 @@ class PkgConfigModule(ExtensionModule):
         pcfile = filebase + '.pc'
         pkgroot = pkgroot_name = kwargs['install_dir'] or default_install_dir
         if pkgroot is None:
-             if mesonlib.is_freebsd():
-                 pkgroot = os.path.join(_as_str(state.environment.coredata.get_option(mesonlib.OptionKey('prefix'))), 'libdata', 'pkgconfig')
-                 pkgroot_name = os.path.join('{prefix}', 'libdata', 'pkgconfig')
-             elif mesonlib.is_haiku():
-                 pkgroot = os.path.join(_as_str(state.environment.coredata.get_option(mesonlib.OptionKey('prefix'))), 'develop', 'lib', 'pkgconfig')
-                 pkgroot_name = os.path.join('{prefix}', 'develop', 'lib', 'pkgconfig')
-             else:
-                 pkgroot = os.path.join(_as_str(state.environment.coredata.get_option(mesonlib.OptionKey('libdir'))), 'pkgconfig')
-                 pkgroot_name = os.path.join('{libdir}', 'pkgconfig')
+            pkgroot = os.path.join(state.environment.coredata.get_option(mesonlib.OptionKey('libdir')), 'pkgconfig')
+            pkgroot_name = os.path.join('{libdir}', 'pkgconfig')
         relocatable = state.get_option('relocatable', module='pkgconfig')
         self._generate_pkgconfig_file(state, deps, subdirs, name, description, url,
                                       version, pcfile, conflicts, variables,