diff --git a/bin/gcc11ize.py b/bin/gcc11ize.py
index 4ccdbbe5258219b59ea0b743ceff9a305d565bf4..bc12162c905e00226112dd7a1ae7cbce8b30cd58 100755
--- a/bin/gcc11ize.py
+++ b/bin/gcc11ize.py
@@ -31,6 +31,7 @@ releases = {
     'FFTW':                     ['3.3.8',           '3.3.10'],
     'Flask':                    ['1.1.4',           '2.0.2'],
     'flex':                     ['2.6.4',           '2.6.4'],
+    'FLTK':                     ['1.3.5',           '1.3.7'],
     'fontconfig':               ['2.13.92',         '2.13.94'],
     'freetype':                 ['2.10.1',          '2.11.0'],
     'FriBidi':                  ['1.0.9',           '1.0.10'],