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