python/build/autotools: add --host=... only if cross-compiling

python/build/autotools.py

@@ -58,11 +58,13 @@ class AutotoolsProject(MakeProject):
             'ARFLAGS=' + toolchain.arflags,
             'RANLIB=' + toolchain.ranlib,
             'STRIP=' + toolchain.strip,
-            '--host=' + toolchain.host_triplet,
             '--prefix=' + toolchain.install_prefix,
             '--disable-silent-rules',
         ]
 
+        if toolchain.host_triplet is not None:
+            configure.append('--host=' + toolchain.host_triplet)
+
         configure.extend(self.configure_args)
 
         try: