diff --git a/system/devel/ninja/actions.py b/system/devel/ninja/actions.py
index ad813b44..ed7d5176 100644
--- a/system/devel/ninja/actions.py
+++ b/system/devel/ninja/actions.py
@@ -18,13 +18,16 @@ def build():
                        if ( j > 0 ) return j;\
                        ' src/ninja.cc""")
     
-    shelltools.system("python configure.py --bootstrap")
+    #shelltools.export("PYTHON","/usr/bin/python3")
+    shelltools.system("grep -rl '^#!.*python$' | xargs sed -i '1s/python/&3/'")
+    
+    shelltools.system("python3 configure.py --bootstrap")
     shelltools.system("asciidoc doc/manual.asciidoc")
     #shelltools.system("emacs -Q --batch -f batch-byte-compile misc/ninja-mode.el")
 
 def check():
     #needs new package gtest -> ignore it for now
-    shelltools.system("python ./configure.py")
+    shelltools.system("python3 ./configure.py")
     shelltools.system("./ninja ninja_test")
     shelltools.system("./ninja_test --gtest_filter=-SubprocessTest.SetWithLots")
 
diff --git a/system/devel/ninja/pspec.xml b/system/devel/ninja/pspec.xml
index 132ce035..09f85159 100755
--- a/system/devel/ninja/pspec.xml
+++ b/system/devel/ninja/pspec.xml
@@ -37,6 +37,13 @@
     </Package>
 
     <History>
+        <Update release="13">
+            <Date>2021-05-29</Date>
+            <Version>1.10.2</Version>
+            <Comment>Rebuild python3.</Comment>
+            <Name>Mustafa Cinasal</Name>
+            <Email>muscnslp@gmail.com</Email>
+        </Update>
         <Update release="12">
             <Date>2021-03-01</Date>
             <Version>1.10.2</Version>