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-rw-r--r--pkgs/development/pharo/vm/build-vm.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/pharo/vm/build-vm.nix b/pkgs/development/pharo/vm/build-vm.nix
index 2f2e125ea39e..054b64db732f 100644
--- a/pkgs/development/pharo/vm/build-vm.nix
+++ b/pkgs/development/pharo/vm/build-vm.nix
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
configureFlags = [ "--without-npsqueak"
"--with-vmversion=5.0"
"--with-src=${vm}" ];
- CFLAGS = "-msse2 -D_GNU_SOURCE -DCOGMTVM=0 -g -O2 -DNDEBUG -DDEBUGVM=0";
+ CFLAGS = "-DPharoVM -DIMMUTABILITY=1 -msse2 -D_GNU_SOURCE -DCOGMTVM=0 -g -O2 -DNDEBUG -DDEBUGVM=0";
LDFLAGS = "-Wl,-z,now";
# VM sources require some patching before build.