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-rw-r--r--nixpkgs/pkgs/development/libraries/cln/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/libraries/cln/default.nix b/nixpkgs/pkgs/development/libraries/cln/default.nix
index a7094d18e6ea..ae3ed853a026 100644
--- a/nixpkgs/pkgs/development/libraries/cln/default.nix
+++ b/nixpkgs/pkgs/development/libraries/cln/default.nix
@@ -13,6 +13,7 @@ gccStdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "C/C++ library for numbers, a part of GiNaC";
+    mainProgram = "pi";
     homepage = "https://www.ginac.de/CLN/";
     license = licenses.gpl2;
     platforms = platforms.unix; # Once had cygwin problems