diff --git a/pypy3.spec b/pypy3.spec
index 0ab7125..70caacc 100644
--- a/pypy3.spec
+++ b/pypy3.spec
@@ -179,25 +179,15 @@ Source189: 189-use-rpm-wheels.patch
 # and avoid a cycle in the build-time dependency graph:
 # Note, pypy3 is built with pypy2, so no dependency cycle
 
-%ifarch %{power64}
-# the build is unreliable with pypy+power, getting random failures
-# so better have a bit slower build than having to build until it pass
-%global use_self_when_building 0
-%else
 %global use_self_when_building 1
-%endif
-
 %if 0%{use_self_when_building}
 # pypy3 can only be build with pypy2
 BuildRequires: pypy2
-# no pypy-pycparser available ATM
 %global bootstrap_python_interp pypy2
 %else
-
-
 # pypy3 can only be build with python2
-BuildRequires: python2-devel
-BuildRequires: python2-pycparser
+# exception to use Python 2: https://pagure.io/fesco/issue/2130
+BuildRequires: python27
 %global bootstrap_python_interp python2
 
 %endif
@@ -356,6 +346,11 @@ rm lib-python/3/idlelib/idle.bat
   sed -i -r 's/\$\(LDFLAGSEXTRA\)/& -fuse-ld=gold/' ./rpython/translator/platform/posix.py
 %endif
 
+%if ! 0%{use_self_when_building}
+  # use the pycparser from PyPy even on CPython
+  ln -s lib_pypy/cffi/_pycparser pycparser
+%endif
+
 %build
 %ifarch s390 s390x
 # pypy3 requires z10 at least