The compilation with GCC 8.2 produces a lot of warnings which are treated as errors by default.
Let the warnings be warnings and pretend we don't care.
--- old/buildSrc/linux.gradle
+++ new/buildSrc/linux.gradle
@@ -234,7 +234,7 @@
 LINUX.glass.glass = [:]
 LINUX.glass.glass.nativeSource = ft_gtk_launcher.getFiles()
 LINUX.glass.glass.compiler = compiler
-LINUX.glass.glass.ccFlags = [ccFlags, gtk2CCFlags,  "-Werror"].flatten()
+LINUX.glass.glass.ccFlags = [ccFlags, gtk2CCFlags,  "-Wno-error"].flatten()
 LINUX.glass.glass.linker = linker
 LINUX.glass.glass.linkFlags = [linkFlags, "-lX11", "-ldl" ].flatten()
 LINUX.glass.glass.lib = "glass"
@@ -242,7 +242,7 @@
 LINUX.glass.glassgtk2 = [:]
 LINUX.glass.glassgtk2.nativeSource =  ft_gtk.getFiles()
 LINUX.glass.glassgtk2.compiler = compiler
-LINUX.glass.glassgtk2.ccFlags = [ccFlags, gtk2CCFlags, "-Werror"].flatten()
+LINUX.glass.glassgtk2.ccFlags = [ccFlags, gtk2CCFlags, "-Wno-error"].flatten()
 LINUX.glass.glassgtk2.linker = linker
 LINUX.glass.glassgtk2.linkFlags = [linkFlags, gtk2LinkFlags ].flatten()
 LINUX.glass.glassgtk2.lib = "glassgtk2"
@@ -250,7 +250,7 @@
 LINUX.glass.glassgtk3 = [:]
 LINUX.glass.glassgtk3.nativeSource =  ft_gtk.getFiles()
 LINUX.glass.glassgtk3.compiler = compiler
-LINUX.glass.glassgtk3.ccFlags = [ccFlags, gtk3CCFlags, "-Werror"].flatten()
+LINUX.glass.glassgtk3.ccFlags = [ccFlags, gtk3CCFlags, "-Wno-error"].flatten()
 LINUX.glass.glassgtk3.linker = linker
 LINUX.glass.glassgtk3.linkFlags = [linkFlags, gtk3LinkFlags ].flatten()
 LINUX.glass.glassgtk3.lib = "glassgtk3"