gpm: split dev, info & man outputs (#482686)

pkgs/by-name/gp/gpm/package.nix

@@ -63,12 +63,19 @@ stdenv.mkDerivation {
   configureFlags = [
     "--sysconfdir=/etc"
     "--localstatedir=/var"
-    (if withNcurses then "--with-curses" else "--without-curses")
+    (lib.withFeature withNcurses "curses")
     # The code won't compile in c23 mode.
     # https://gcc.gnu.org/gcc-15/porting_to.html#c23-fn-decls-without-parameters
     "CFLAGS=-std=gnu17"
   ];
 
+  outputs = [
+    "out"
+    "dev"
+    "info"
+    "man"
+  ];
+
   enableParallelBuilding = true;
 
   # Provide libgpm.so for compatibility