In fact it should be 'python', updated patch coming
diff -Nru raqm-0.7.0/debian/control raqm-0.7.0/debian/control --- raqm-0.7.0/debian/control 2019-07-07 04:36:51.000000000 +0200 +++ raqm-0.7.0/debian/control 2019-12-11 11:15:05.000000000 +0100 @@ -6,6 +6,7 @@ Build-Depends: debhelper (>= 12), pkg-config, + python, libfreetype6-dev (>= 2.4.2), libfribidi-dev, libharfbuzz-dev,

