Fix false positive when detecting header-only library presence

makepanda/makepandacore.py

@@ -1534,7 +1534,7 @@ def SmartPkgEnable(pkg, pkgconfig = None, libs = None, incs = None, defs = None,
             if (have_all_pkgs):
                 return
 
-    if pkgconfig is not None and not libs and not incs:
+    if pkgconfig is not None and not libs:
         # pkg-config is all we can do, abort if it wasn't found.
         if pkg in PkgListGet():
             print("%sWARNING:%s Could not locate pkg-config package %s, excluding from build" % (GetColor("red"), GetColor(), pkgconfig))