Allow the configuration file to be specified via an environment variable.

---
 src/gclue-config.c        | 13 ++++++++++---
 src/gclue-static-source.c |  2 +-
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/gclue-config.c b/src/gclue-config.c
index acd6009..3045571 100644
--- a/src/gclue-config.c
+++ b/src/gclue-config.c
@@ -26,8 +26,8 @@
 
 #include "gclue-config.h"
 
-#define CONFIG_FILE_PATH SYSCONFDIR "/geoclue/geoclue.conf"
-#define CONFIG_D_DIRECTORY SYSCONFDIR "/geoclue/conf.d/"
+#define CONFIG_FILE_PATH "/etc/geoclue/geoclue.conf"
+#define CONFIG_D_DIRECTORY "/etc/geoclue/conf.d/"
 
 /* This class will be responsible for fetching configuration. */
 
@@ -546,8 +546,15 @@ gclue_config_init (GClueConfig *config)
         priv->wifi_submit_url = g_strdup (DEFAULT_WIFI_SUBMIT_URL);
         priv->wifi_submit_nick = g_strdup (DEFAULT_WIFI_SUBMIT_NICK);
 
-        /* Load config file from default path, log all missing parameters */
         priv->key_file = g_key_file_new ();
+
+        char *env_config_file = g_getenv ("GEOCLUE_CONFIG_FILE");
+        if (env_config_file) {
+                load_config_file (config, env_config_file);
+                goto out; // don't load conf.d
+        }
+
+        /* Load config file from default path, log all missing parameters */
         load_config_file (config, CONFIG_FILE_PATH);
 
         /*
diff --git a/src/gclue-static-source.c b/src/gclue-static-source.c
index 1c35cea..7957797 100644
--- a/src/gclue-static-source.c
+++ b/src/gclue-static-source.c
@@ -26,7 +26,7 @@
 #include "gclue-enum-types.h"
 
2018-11-18gnu: hurd: Build against glibc 2.28....