+# Note these are chosen very specifically to ensure the different
+# versions work together. Don't blindly update to the latest
+# versions. See also:
+# https://github.com/riscv/riscv-pk/issues/18#issuecomment-206115996
+RISCV_QEMU_COMMIT = 94f5eb73091fb4fe272db3e943f173ecc0f78ffd
+RISCV_QEMU_SHORTCOMMIT = 94f5eb73
+RISCV_GNU_TOOLCHAIN_COMMIT = 728afcddcb0526a0f6560c4032da82805f054d58
+RISCV_GNU_TOOLCHAIN_SHORTCOMMIT = 728afcdd
+RISCV_PK_COMMIT = 85ae17aa149b9ea114bdd70cc30ea7e73813fb48
+RISCV_PK_SHORTCOMMIT = 85ae17aa
+
+# For the correct versions, see
+# riscv-gnu-toolchain/Makefile.in *_version variables
+BINUTILS_VERSION = 2.25.1
+GLIBC_VERSION = 2.22
+GCC_VERSION = 5.3.0
+NEWLIB_VERSION = 2.2.0
+