ffi-power.patch

--- a/Rakefile
+++ b/Rakefile
@@ -36,6 +36,10 @@ CPU = case RbConfig::CONFIG['host_cpu'].downcase
    when /amd64|x86_64/
      "x86_64"
+  when /powerpc64le/
+    "ppc64le"
+
+
    when /ppc64|powerpc64/
      "powerpc64"
+++ b/ext/ffi_c/libffi.gnu.mk
@@ -20,6 +20,7 @@ else
  endif
  LIBFFI = "$(LIBFFI_BUILD_DIR)"/.libs/libffi_convenience.a
+LIBFFI_AUTOGEN = "$(LIBFFI_SRC_DIR)"/autogen.sh
  LIBFFI_CONFIGURE = "$(LIBFFI_SRC_DIR)"/configure --disable-static \
         --with-pic=yes --disable-dependency-tracking
@@ -4,6 +4,10 @@ include ${srcdir}/libffi.gnu.mk
  $(LIBFFI):
         @mkdir -p "$(LIBFFI_BUILD_DIR)" "$@(D)"
+       @if [ ! -f "$(LIBFFI_SRC_DIR)"/configure ]; then \
+           echo "Running autogen libffi"; \
+           cd "$(LIBFFI_SRC_DIR)" && $(LIBFFI_AUTOGEN); \
+       fi
         @if [ ! -f "$(LIBFFI_BUILD_DIR)"/Makefile ]; then \
             echo "Configuring libffi"; \
             cd "$(LIBFFI_BUILD_DIR)" && \