nix: fix md5sum on MacOS

The default on MacOS is `md5`, while Nix only has `md5sum` available.
Therefore, make it possible to override the variable via the environment
so that flake.nix can set the correct binary name.

1 files changed, 4 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
index 30e5cde1d..53d8fab45 100644
--- a/flake.nix
+++ b/flake.nix
@@ -72,6 +72,10 @@
             export LLVM_AR=llvm-ar
             export LLVM_NM=llvm-nm
 
+            # Make `make smoketest` work (the default is `md5`, while Nix only
+            # has `md5sum`).
+            export MD5SUM=md5sum
+
             # Ugly hack to make the Clang resources directory available.
             export GOFLAGS="\"-ldflags=-X github.com/tinygo-org/tinygo/goenv.clangResourceDir=${llvmPackages_16.clang.cc.lib}/lib/clang/16"\"
           '';