Taken from https://github.com/SuperTux/supertux/commit/a75317ef0a94847d9b6a7833b9c6652ef29edde3.
This patch fixes building with gcc versions earlier than 6.

From a75317ef0a94847d9b6a7833b9c6652ef29edde3 Mon Sep 17 00:00:00 2001
From: Ingo Ruhnke <grumbel@gmail.com>
Date: Fri, 28 Dec 2018 22:45:35 +0100
Subject: [PATCH] Add workaround for backwards compatibilty with gcc5

Fixes #1014
---
 src/video/gl/gl_painter.cpp | 11 ++++++-----
 src/video/ttf_surface.cpp   | 16 +++++++++-------
 2 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/src/video/gl/gl_painter.cpp b/src/video/gl/gl_painter.cpp
index 5e0d1e7b1e..32fb7a09b6 100644
--- a/src/video/gl/gl_painter.cpp
+++ b/src/video/gl/gl_painter.cpp
@@ -37,12 +37,13 @@ namespace {
 
 inline std::tuple<GLenum, GLenum> blend_factor(Blend blend)
 {
+  using B = std::tuple<GLenum, GLenum>;
   switch(blend) {
-    case Blend::NONE: return {GL_ONE, GL_ZERO};
-    case Blend::BLEND: return {GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA};
-    case Blend::ADD: return {GL_SRC_ALPHA, GL_ONE};
-    case Blend::MOD: return {GL_DST_COLOR, GL_ZERO};
-    default: return {GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA};
+    case Blend::NONE: return B(GL_ONE, GL_ZERO);
+    case Blend::BLEND: return B(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    case Blend::ADD: return B(GL_SRC_ALPHA, GL_ONE);
+    case Blend::MOD: return B(GL_DST_COLOR, GL_ZERO);
+    default: return B(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   }
 }
 
diff --git a/src/video/ttf_surface.cpp b/src/video/ttf_surface.cpp
index 7c9505004f..b41d67b2c8 100644
--- a/src/video/ttf_surface.cpp
+++ b/src/video/ttf_surface.cpp
@@ -55,12 +55,13 @@ TTFSurface::create(const TTFFont& font, const std::string& text)
     SDL_SetSurfaceColorMod(text_surface.get(), 0, 0, 0);
     SDL_SetSurfaceBlendMode(text_surface.get(), SDL_BLENDMODE_BLEND);
 
+    using P = std::tuple<int, int>;
     const std::initializer_list<std::tuple<int, int> > positions[] = {
       {},
-      {{0, 0}},
-      {{-1, 0}, {1, 0}, {0, -1}, {0, 1}},
-      {{-2, 0}, {2, 0}, {0, -2}, {0, 2},
-       {-1, -1}, {1, -1}, {-1, 1}, {1, 1}}
+      {P{0, 0}},
+      {P{-1, 0}, P{1, 0}, P{0, -1}, P{0, 1}},
+      {P{-2, 0}, P{2, 0}, P{0, -2}, P{0, 2},
+       P{-1, -1}, P{1, -1}, P{-1, 1}, P{1, 1}}
     };
 
     int shadow_size = std::min(2, font.get_shadow_size());
@@ -77,11 +78,12 @@ TTFSurface::create(const TTFFont& font, const std::string& text)
     SDL_SetSurfaceColorMod(text_surface.get(), 0, 0, 0);
     SDL_SetSurfaceBlendMode(text_surface.get(), SDL_BLENDMODE_BLEND);
 
+    using P = std::tuple<int, int>;
     const std::initializer_list<std::tuple<int, int> > positions[] = {
       {},
-      {{-1, 0}, {1, 0}, {0, -1}, {0, 1}},
-      {{-2, 0}, {2, 0}, {0, -2}, {0, 2},
-       {-1, -1}, {1, -1}, {-1, 1}, {1, 1}}
+      {P{-1, 0}, P{1, 0}, P{0, -1}, P{0, 1}},
+      {P{-2, 0}, P{2, 0}, P{0, -2}, P{0, 2},
+       P{-1, -1}, P{1, -1}, P{-1, 1}, P{1, 1}}
     };
 
     int border = std::min(2, font.get_border());