https://bugs.gentoo.org/979126

--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -270,7 +270,7 @@
 
 $(EXTSOURCES): c_client.py $(XCBPROTO_XCBINCLUDEDIR)/$(@:.c=.xml)
 	$(AM_V_GEN)$(PYTHON) $(srcdir)/c_client.py	-c "$(PACKAGE_STRING)" -l "$(XORG_MAN_PAGE)" \
-		-s "$(LIB_MAN_SUFFIX)" -p $(XCBPROTO_XCBPYTHONDIR) \
+		-s "$(LIB_MAN_SUFFIX)" -p "$(XCBPROTO_XCBPYTHONDIR)" \
 		$(C_CLIENT_PY_EXTRA_ARGS) \
 		$(XCBPROTO_XCBINCLUDEDIR)/$(@:.c=.xml)
 
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -1423,7 +1423,7 @@
 
 $(EXTSOURCES): c_client.py $(XCBPROTO_XCBINCLUDEDIR)/$(@:.c=.xml)
 	$(AM_V_GEN)$(PYTHON) $(srcdir)/c_client.py	-c "$(PACKAGE_STRING)" -l "$(XORG_MAN_PAGE)" \
-		-s "$(LIB_MAN_SUFFIX)" -p $(XCBPROTO_XCBPYTHONDIR) \
+		-s "$(LIB_MAN_SUFFIX)" -p "$(XCBPROTO_XCBPYTHONDIR)" \
 		$(C_CLIENT_PY_EXTRA_ARGS) \
 		$(XCBPROTO_XCBINCLUDEDIR)/$(@:.c=.xml)