diff --git a/Makefile b/Makefile
index fc8bbeee..229a6383 100644
--- a/Makefile
+++ b/Makefile
@@ -99,6 +99,7 @@ PYTHON_CONFIG=python-config
 
 PYTHON_INCLUDES=$(shell $(PYTHON_CONFIG) --includes)
 PYTHON_LIBS=$(shell $(PYTHON_CONFIG) --libs)
+PYTHON_SITE_DIR=$(shell $(PYTHON) -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")
 
 # Support having multiple named plugins
 # e.g. "python2.7" "python3.2mu" "python 3.2dmu" etc:
@@ -234,6 +235,10 @@ install: $(PLUGIN_DSO) gcc-with-$(PLUGIN_NAME).1.gz
 	cp -a gccutils $(DESTDIR)$(GCCPLUGINS_DIR)/$(PLUGIN_DIR)
 	cp -a libcpychecker $(DESTDIR)$(GCCPLUGINS_DIR)/$(PLUGIN_DIR)
 
+	# add python dir to python search path
+	mkdir -p $(PYTHON_SITE_DIR)
+	echo "$(DESTDIR)$(GCCPLUGINS_DIR)/$(PLUGIN_DIR)" > $(PYTHON_SITE_DIR)/gcc-python-plugin.pth
+
 	# Create "gcc-with-" support script:
 	mkdir -p $(DESTDIR)$(bindir)
 	install -m 755 gcc-with-python $(DESTDIR)/$(bindir)/gcc-with-$(PLUGIN_NAME)
diff --git a/gcc-c-api/gcc-location.c b/gcc-c-api/gcc-location.c
index c3b26875..d4e1d842 100644
--- a/gcc-c-api/gcc-location.c
+++ b/gcc-c-api/gcc-location.c
@@ -54,7 +54,7 @@ GCC_IMPLEMENT_PUBLIC_API (int) gcc_location_get_column (gcc_location loc)
 
 GCC_PUBLIC_API (bool) gcc_location_is_unknown (gcc_location loc)
 {
-  return UNKNOWN_LOCATION == loc.inner;
+  return UNKNOWN_LOCATION == loc.inner || !gcc_location_get_filename(loc);
 }
 
 GCC_IMPLEMENT_PUBLIC_API (bool) gcc_location_get_in_system_header (gcc_location loc)
diff --git a/gccutils/__init__.py b/gccutils/__init__.py
index 2d3064a5..2c8c5d2f 100644
--- a/gccutils/__init__.py
+++ b/gccutils/__init__.py
@@ -24,7 +24,10 @@ def sorted_dict_repr(d):
 def get_src_for_loc(loc):
     # Given a gcc.Location, get the source line as a string
     import linecache
-    return linecache.getline(loc.file, loc.line).rstrip()
+    try:
+        return linecache.getline(loc.file, loc.line).rstrip()
+    except SyntaxError: # unrecognized encoding of file
+        return ''
 
 def get_field_by_name(typeobj, name):
     check_isinstance(typeobj,