anchor.diff:          };
   
           pdo_mysql = {
  -          configureFlags = ["--with-pdo-mysql=${mysql.lib.dev}"];
  -          buildInputs = [ mysql.lib.dev ];
  +          configureFlags = ["--with-pdo-mysql=${mysqlHeaders}"];
  +          buildInputs = [ mysqlHeaders ];
           };
   
           bcmath = {
  
positive.code:   generic =
      { version, sha256 }:
  
      let php7 = lib.versionAtLeast version "7.0"; in
  
      composableDerivation.composableDerivation {} (fixed: {
  
        inherit version;
  
  
negative.code: 
          mysql = {
            configureFlags = ["--with-mysql"];
            buildInputs = [ mysqlHeaders ];
          };
  
          mysqli = {
            configureFlags = ["--with-mysqli=${mysqlHeaders}/bin/mysql_config"];
            buildInputs = [ mysqlHeaders ];
          };
  
          mysqli_embedded = {
  