diff --git a/bootstrap.sh b/bootstrap.sh
index b562c99..4f14417 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -106,6 +106,8 @@ osx_macports()
     install_macports_pkg "osxfuse"
     install_macports_pkg "x86_64-elf-gcc"
     install_macports_pkg "cmake"
+    install_macports_pkg "ninja"
+    install_macports_pkg "po4a"
 }
 
 ###############################################################################
@@ -137,6 +139,8 @@ osx_homebrew()
     install_brew_pkg "gcc@7" "gcc-7"
     install_brew_pkg "pkg-config"
     install_brew_pkg "cmake"
+    install_brew_pkg "ninja"
+    install_brew_pkg "po4a"
     install_brew_pkg "Caskroom/cask/osxfuse"
 
     install_brew_pkg "redox-os/gcc_cross_compilers/x86_64-elf-gcc" "x86_64-elf-gcc"