while (<DATA>) {
   if ($_ =~ /^E/gi || $_ =~ /gmake.*/gi) {
      push (@errors, $_)
   }
}

print(@errors);

__DATA__
E : abcdfcsds 1387382 43243
ijigje jg445 3u4 (53545545)
E : abcdfcsds 1387382 43243
...
E : abcdfcsds 1387382 43243
ijigje jg445 3u4 (53545545)
gmake : **** build failed fdjgu43uffer Error 1

##</code><code>##

E : abcdfcsds 1387382 43243
E : abcdfcsds 1387382 43243
E : abcdfcsds 1387382 43243
gmake : **** build failed fdjgu43uffer Error 1

##</code><code>##

while (<DATA>) {
   if (/^(?:E|gmake)\s*:/) {
      push(@errors, $_);
   }
}