Linux installer: Check that freetype is new enough

setup/linux-installer.py

@@ -799,6 +799,19 @@ def check_glibc_version(min_required=(2, 31), release_date='2020-02-01'):
         ).format(ver, '.'.join(map(str, min_required)), release_date))
 
 
+def check_for_recent_freetype():
+    import ctypes
+    try:
+        f = ctypes.CDLL('libfreetype.so')
+    except OSError:
+        raise SystemExit('Your system is missing the FreeType library libfreetype.so. Try installing the freetype package.')
+    try:
+        f.FT_Get_Color_Glyph_Paint
+    except AttributeError:
+        raise SystemExit('Your system has too old a version of the FreeType library.'
+                         ' freetype >= 2.11 is needed for the FT_Get_Color_Glyph_Paint function which is required by Qt WebEngine')
+
+
 def main(install_dir=None, isolated=False, bin_dir=None, share_dir=None, ignore_umask=False, version=None):
     if not ignore_umask and not isolated:
         check_umask()
@@ -825,6 +838,8 @@ def main(install_dir=None, isolated=False, bin_dir=None, share_dir=None, ignore_
         check_for_libOpenGl()
     if q[0] >= 7:
         check_for_libxcb_cursor()
+    if q >= (7, 16, 0):
+        check_for_recent_freetype()
     run_installer(install_dir, isolated, bin_dir, share_dir, version)
 
 

setup/linux-installer.sh

@@ -848,6 +848,19 @@ def check_glibc_version(min_required=(2, 31), release_date='2020-02-01'):
         ).format(ver, '.'.join(map(str, min_required)), release_date))
 
 
+def check_for_recent_freetype():
+    import ctypes
+    try:
+        f = ctypes.CDLL('libfreetype.so')
+    except OSError:
+        raise SystemExit('Your system is missing the FreeType library libfreetype.so. Try installing the freetype package.')
+    try:
+        f.FT_Get_Color_Glyph_Paint
+    except AttributeError:
+        raise SystemExit('Your system has too old a version of the FreeType library.'
+                         ' freetype >= 2.11 is needed for the FT_Get_Color_Glyph_Paint function which is required by Qt WebEngine')
+
+
 def main(install_dir=None, isolated=False, bin_dir=None, share_dir=None, ignore_umask=False, version=None):
     if not ignore_umask and not isolated:
         check_umask()
@@ -874,6 +887,8 @@ def main(install_dir=None, isolated=False, bin_dir=None, share_dir=None, ignore_
         check_for_libOpenGl()
     if q[0] >= 7:
         check_for_libxcb_cursor()
+    if q >= (7, 16, 0):
+        check_for_recent_freetype()
     run_installer(install_dir, isolated, bin_dir, share_dir, version)