1 files changed, 6 insertions, 0 deletions
diff --git a/pkgs/development/compilers/ocaml/4.06.nix b/pkgs/development/compilers/ocaml/4.06.nix
index 0f5e0a2d70be2..6e06ad585b2c6 100644
--- a/pkgs/development/compilers/ocaml/4.06.nix
+++ b/pkgs/development/compilers/ocaml/4.06.nix
@@ -12,4 +12,10 @@ import ./generic.nix {
     { url = "https://github.com/ocaml/ocaml/commit/137a4ad167f25fe1bee792977ed89f30d19bcd74.patch";
       sha256 = "sha256:0izsf6rm3677vbbx0snkmn9pkfcsayrdwz3ipiml5wjiaysnchjz"; }
   ];
+
+  # Workaround build failure on -fno-common toolchains like upstream
+  # gcc-10. Otherwise build fails as:
+  #   ld: libcamlrun.a(startup.o):(.bss+0x800): multiple definition of
+  #     `caml_code_fragments_table'; libcamlrun.a(backtrace.o):(.bss+0x20): first defined here
+  NIX_CFLAGS_COMPILE = "-fcommon";
 }