commit d8e0bac0c0d831510683939ec7a7b5bd72192423
Author: Frederik Rietdijk <fridh@fridh.nl>
Date:   Sat Jan 5 11:38:28 2019 +0100

    Have a top-level attribute for the executable

diff --git a/pkgconfig/pkgconfig.py b/pkgconfig/pkgconfig.py
index 3deb97f..e7c5561 100644
--- a/pkgconfig/pkgconfig.py
+++ b/pkgconfig/pkgconfig.py
@@ -30,6 +30,9 @@ from functools import wraps
 from subprocess import call, PIPE, Popen
 
 
+PKG_CONFIG_EXE = "pkg-config"
+
+
 def _compare_versions(v1, v2):
     """
     Compare two version strings and return -1, 0 or 1 depending on the equality
@@ -65,7 +68,7 @@ def _convert_error(func):
 
 @_convert_error
 def _query(package, *options):
-    pkg_config_exe = os.environ.get('PKG_CONFIG', None) or 'pkg-config'
+    pkg_config_exe = os.environ.get('PKG_CONFIG', None) or PKG_CONFIG_EXE
     cmd = '{0} {1} {2}'.format(pkg_config_exe, ' '.join(options), package)
     proc = Popen(shlex.split(cmd), stdout=PIPE, stderr=PIPE)
     out, err = proc.communicate()
@@ -84,7 +87,7 @@ def exists(package):
 
     If ``pkg-config`` not on path, raises ``EnvironmentError``.
     """
-    pkg_config_exe = os.environ.get('PKG_CONFIG', None) or 'pkg-config'
+    pkg_config_exe = os.environ.get('PKG_CONFIG', None) or PKG_CONFIG_EXE
     cmd = '{0} --exists {1}'.format(pkg_config_exe, package).split()
     return call(cmd) == 0