diff --git a/src/engine/aa.cc b/src/engine/aa.cc
index 586e941..3c700a3 100644
--- a/src/engine/aa.cc
+++ b/src/engine/aa.cc
@@ -1,3 +1,5 @@
+#include "aa.hh"
+
 #include "engine.hh"
 
 extern int intel_texalpha_bug;
@@ -10,13 +12,13 @@ FVAR(tqaacolorweightscale, 0, 0.25f, 1e3f);
 FVAR(tqaacolorweightbias, 0, 0.01f, 1);
 VAR(tqaaresolvegather, 1, 0, 0);
 
-int tqaaframe = 0;
-GLuint tqaatex[2] = { 0, 0 }, tqaafbo[2] = { 0, 0 };
-matrix4 tqaaprevscreenmatrix;
+static int tqaaframe = 0;
+static GLuint tqaatex[2] = { 0, 0 }, tqaafbo[2] = { 0, 0 };
+static matrix4 tqaaprevscreenmatrix;
 
-int tqaatype = -1;
+static int tqaatype = -1;
 
-void loadtqaashaders()
+static void loadtqaashaders()
 {
     tqaatype = tqaamovemask ? AA_MASKED : AA_UNUSED;
     loadhdrshaders(tqaatype);
@@ -24,7 +26,7 @@ void loadtqaashaders()
     useshaderbyname("tqaaresolve");
 }
 
-void setuptqaa(int w, int h)
+static void setuptqaa(int w, int h)
 {
     loopi(2)
     {
@@ -44,7 +46,7 @@ void setuptqaa(int w, int h)
     loadtqaashaders();
 }
 
-void cleanuptqaa()
+static void cleanuptqaa()
 {
     tqaatype = -1;
     loopi(2) if(tqaatex[i]) { glDeleteTextures(1, &tqaatex[i]); tqaatex[i] = 0; }
@@ -74,7 +76,7 @@ void setaavelocityparams(GLenum tmu)
 
 VAR(debugtqaa, 0, 0, 2);
 
-void viewtqaa()
+static void viewtqaa()
 {
     int w = min(hudw, hudh)*1.0f, h = (w*hudh)/hudw, tw = gw, th = gh;
     SETSHADER(hudrect);
@@ -87,7 +89,7 @@ void viewtqaa()
     debugquad(0, 0, w, h, 0, 0, tw, th);
 }
 
-void resolvetqaa(GLuint outfbo)
+static void resolvetqaa(GLuint outfbo)
 {
     glBindFramebuffer_(GL_FRAMEBUFFER, outfbo);
     SETSHADER(tqaaresolve);
@@ -109,7 +111,7 @@ void resolvetqaa(GLuint outfbo)
     tqaaframe++;
 }
 
-void dotqaa(GLuint outfbo = 0)
+static void dotqaa(GLuint outfbo = 0)
 {
     timer *tqaatimer = begintimer("tqaa");
 
@@ -118,14 +120,30 @@ void dotqaa(GLuint outfbo = 0)
     endtimer(tqaatimer);
 }
 
-GLuint fxaafbo = 0, fxaatex = 0;
+static GLuint fxaafbo = 0, fxaatex = 0;
 
-extern int fxaaquality, fxaagreenluma;
-
-int fxaatype = -1;
+static int fxaatype = -1;
 static Shader *fxaashader = NULL;
 
-void loadfxaashaders()
+static void clearfxaashaders()
+{
+    fxaatype = -1;
+    fxaashader = NULL;
+}
+
+static void cleanupfxaa()
+{
+    if(fxaafbo) { glDeleteFramebuffers_(1, &fxaafbo); fxaafbo = 0; }
+    if(fxaatex) { glDeleteTextures(1, &fxaatex); fxaatex = 0; }
+
+    clearfxaashaders();
+}
+
+VARFP(fxaa, 0, 0, 1, cleanupfxaa());
+VARFP(fxaaquality, 0, 1, 3, cleanupfxaa());
+VARFP(fxaagreenluma, 0, 0, 1, cleanupfxaa());
+
+static void loadfxaashaders()
 {
     fxaatype = tqaatype >= 0 ? tqaatype : (!fxaagreenluma && !intel_texalpha_bug ? AA_LUMA : AA_UNUSED);
     loadhdrshaders(fxaatype);
@@ -139,13 +157,7 @@ void loadfxaashaders()
     fxaashader = generateshader(fxaaname, "fxaashaders %d \"%s\"", fxaaquality, opts);
 }
 
-void clearfxaashaders()
-{
-    fxaatype = -1;
-    fxaashader = NULL;
-}
-
-void setupfxaa(int w, int h)
+static void setupfxaa(int w, int h)
 {
     if(!fxaatex) glGenTextures(1, &fxaatex);
     if(!fxaafbo) glGenFramebuffers_(1, &fxaafbo);
@@ -160,19 +172,7 @@ void setupfxaa(int w, int h)
     loadfxaashaders();
 }
 
-void cleanupfxaa()
-{
-    if(fxaafbo) { glDeleteFramebuffers_(1, &fxaafbo); fxaafbo = 0; }
-    if(fxaatex) { glDeleteTextures(1, &fxaatex); fxaatex = 0; }
-
-    clearfxaashaders();
-}
-
-VARFP(fxaa, 0, 0, 1, cleanupfxaa());
-VARFP(fxaaquality, 0, 1, 3, cleanupfxaa());
-VARFP(fxaagreenluma, 0, 0, 1, cleanupfxaa());
-
-void dofxaa(GLuint outfbo = 0)
+static void dofxaa(GLuint outfbo = 0)
 {
     timer *fxaatimer = begintimer("fxaa");
 
@@ -186,15 +186,47 @@ void dofxaa(GLuint outfbo = 0)
     endtimer(fxaatimer);
 }
 
-GLuint smaaareatex = 0, smaasearchtex = 0, smaafbo[4] = { 0, 0, 0, 0 }, smaatex[5] = { 0, 0, 0, 0, 0 };
-int smaasubsampleorder = -1;
+static GLuint smaaareatex = 0, smaasearchtex = 0, smaafbo[4] = { 0, 0, 0, 0 }, smaatex[5] = { 0, 0, 0, 0, 0 };
+static int smaasubsampleorder = -1;
 
-extern int smaaquality, smaagreenluma, smaacoloredge, smaadepthmask, smaastencil;
-
-int smaatype = -1;
+static int smaatype = -1;
 static Shader *smaalumaedgeshader = NULL, *smaacoloredgeshader = NULL, *smaablendweightshader = NULL, *smaaneighborhoodshader = NULL;
 
-void loadsmaashaders(bool split = false)
+VAR(smaat2x, 1, 0, 0);
+VAR(smaas2x, 1, 0, 0);
+VAR(smaa4x, 1, 0, 0);
+
+static void clearsmaashaders()
+{
+    smaatype = -1;
+    smaalumaedgeshader = NULL;
+    smaacoloredgeshader = NULL;
+    smaablendweightshader = NULL;
+    smaaneighborhoodshader = NULL;
+}
+
+static void cleanupsmaa()
+{
+    if(smaaareatex) { glDeleteTextures(1, &smaaareatex); smaaareatex = 0; }
+    if(smaasearchtex) { glDeleteTextures(1, &smaasearchtex); smaasearchtex = 0; }
+    loopi(4) if(smaafbo[i]) { glDeleteFramebuffers_(1, &smaafbo[i]); smaafbo[i] = 0; }
+    loopi(5) if(smaatex[i]) { glDeleteTextures(1, &smaatex[i]); smaatex[i] = 0; }
+    smaasubsampleorder = -1;
+    smaat2x = smaas2x = smaa4x = 0;
+
+    clearsmaashaders();
+}
+
+VARFP(smaa, 0, 0, 1, cleanupgbuffer());
+VARFP(smaaspatial, 0, 1, 1, cleanupgbuffer());
+VARFP(smaaquality, 0, 2, 3, cleanupsmaa());
+VARFP(smaacoloredge, 0, 0, 1, cleanupsmaa());
+VARFP(smaagreenluma, 0, 0, 1, cleanupsmaa());
+VARF(smaadepthmask, 0, 1, 1, cleanupsmaa());
+VARF(smaastencil, 0, 1, 1, cleanupsmaa());
+VAR(debugsmaa, 0, 0, 5);
+
+static void loadsmaashaders(bool split = false)
 {
     smaatype = tqaatype >= 0 ? tqaatype : (!smaagreenluma && !intel_texalpha_bug && !smaacoloredge ? AA_LUMA : AA_UNUSED);
     if(split) smaatype += AA_SPLIT;
@@ -231,21 +263,12 @@ void loadsmaashaders(bool split = false)
     if(!smaaneighborhoodshader) smaaneighborhoodshader = nullshader;
 }
 
-void clearsmaashaders()
-{
-    smaatype = -1;
-    smaalumaedgeshader = NULL;
-    smaacoloredgeshader = NULL;
-    smaablendweightshader = NULL;
-    smaaneighborhoodshader = NULL;
-}
-
 #define SMAA_SEARCHTEX_WIDTH 66
 #define SMAA_SEARCHTEX_HEIGHT 33
 static uchar smaasearchdata[SMAA_SEARCHTEX_WIDTH*SMAA_SEARCHTEX_HEIGHT];
 static bool smaasearchdatainited = false;
 
-void gensmaasearchdata()
+static void gensmaasearchdata()
 {
     if(smaasearchdatainited) return;
     int edges[33];
@@ -268,7 +291,7 @@ void gensmaasearchdata()
     smaasearchdatainited = true;
 }
 
-vec2 areaunderortho(const vec2 &p1, const vec2 &p2, float x)
+static vec2 areaunderortho(const vec2 &p1, const vec2 &p2, float x)
 {
     vec2 d(p2.x - p1.x, p2.y - p1.y);
     float y1 = p1.y + (x - p1.x)*d.y/d.x,
@@ -306,7 +329,7 @@ static inline void smootharea(float d, vec2 &a1, vec2 &a2)
     a2.lerp(b2, a2, p);
 }
 
-vec2 areaortho(int pattern, float left, float right, float offset)
+static vec2 areaortho(int pattern, float left, float right, float offset)
 {
     float d = left + right + 1, o1 = offset + 0.5f, o2 = offset - 0.5f;
     switch(pattern)
@@ -351,7 +374,7 @@ vec2 areaortho(int pattern, float left, float right, float offset)
     return vec2(0, 0);
 }
 
-float areaunderdiag(const vec2 &p1, const vec2 &p2, const vec2 &p)
+static float areaunderdiag(const vec2 &p1, const vec2 &p2, const vec2 &p)
 {
     vec2 d(p2.y - p1.y, p1.x - p2.x);
     float dp = d.dot(vec2(p1).sub(p));
@@ -423,7 +446,7 @@ static inline vec2 areadiag2(float p1x, float p1y, float p2x, float p2y, float p
     return areadiag(p1, p2, left).avg(areadiag(p3, p4, left));
 }
 
-vec2 areadiag(int pattern, float left, float right, const vec2 &offset)
+static vec2 areadiag(int pattern, float left, float right, const vec2 &offset)
 {
     float d = left + right + 1;
     switch(pattern)
@@ -456,7 +479,7 @@ static const float offsetsdiag[][2] = { { 0.0f, 0.0f, }, { 0.25f, -0.25f }, { -0
 static uchar smaaareadata[SMAA_AREATEX_WIDTH*SMAA_AREATEX_HEIGHT*2];
 static bool smaaareadatainited = false;
 
-void gensmaaareadata()
+static void gensmaaareadata()
 {
     if(smaaareadatainited) return;
     memset(smaaareadata, 0, sizeof(smaaareadata));
@@ -495,11 +518,7 @@ void gensmaaareadata()
     smaaareadatainited = true;
 }
 
-VAR(smaat2x, 1, 0, 0);
-VAR(smaas2x, 1, 0, 0);
-VAR(smaa4x, 1, 0, 0);
-
-void setupsmaa(int w, int h)
+static void setupsmaa(int w, int h)
 {
     if(!smaaareatex) glGenTextures(1, &smaaareatex);
     if(!smaasearchtex) glGenTextures(1, &smaasearchtex);
@@ -543,28 +562,7 @@ void setupsmaa(int w, int h)
     loadsmaashaders(split);
 }
 
-void cleanupsmaa()
-{
-    if(smaaareatex) { glDeleteTextures(1, &smaaareatex); smaaareatex = 0; }
-    if(smaasearchtex) { glDeleteTextures(1, &smaasearchtex); smaasearchtex = 0; }
-    loopi(4) if(smaafbo[i]) { glDeleteFramebuffers_(1, &smaafbo[i]); smaafbo[i] = 0; }
-    loopi(5) if(smaatex[i]) { glDeleteTextures(1, &smaatex[i]); smaatex[i] = 0; }
-    smaasubsampleorder = -1;
-    smaat2x = smaas2x = smaa4x = 0;
-
-    clearsmaashaders();
-}
-
-VARFP(smaa, 0, 0, 1, cleanupgbuffer());
-VARFP(smaaspatial, 0, 1, 1, cleanupgbuffer());
-VARFP(smaaquality, 0, 2, 3, cleanupsmaa());
-VARFP(smaacoloredge, 0, 0, 1, cleanupsmaa());
-VARFP(smaagreenluma, 0, 0, 1, cleanupsmaa());
-VARF(smaadepthmask, 0, 1, 1, cleanupsmaa());
-VARF(smaastencil, 0, 1, 1, cleanupsmaa());
-VAR(debugsmaa, 0, 0, 5);
-
-void viewsmaa()
+static void viewsmaa()
 {
     int w = min(hudw, hudh)*1.0f, h = (w*hudh)/hudw, tw = gw, th = gh;
     SETSHADER(hudrect);
@@ -580,7 +578,7 @@ void viewsmaa()
     debugquad(0, 0, w, h, 0, 0, tw, th);
 }
 
-void dosmaa(GLuint outfbo = 0, bool split = false)
+static void dosmaa(GLuint outfbo = 0, bool split = false)
 {
     timer *smaatimer = begintimer("smaa");
 
@@ -690,7 +688,7 @@ void jitteraa()
     }
 }
 
-int aamaskstencil = -1, aamask = -1;
+static int aamaskstencil = -1, aamask = -1;
 
 void setaamask(bool on)
 {
@@ -770,4 +768,3 @@ void cleanupaa()
     cleanupfxaa();
     cleanuptqaa();
 }
-
diff --git a/src/engine/aa.hh b/src/engine/aa.hh
new file mode 100644
index 0000000..6147858
--- /dev/null
+++ b/src/engine/aa.hh
@@ -0,0 +1,26 @@
+#ifndef AA_HH
+#define AA_HH
+
+#include <shared/gl.hh>
+
+#include <shared/tools.hh>
+#include <shared/geom.hh>
+
+extern matrix4 nojittermatrix;
+
+void setaavelocityparams(GLenum tmu = GL_TEXTURE0);
+
+void setupaa(int w, int h);
+void jitteraa();
+void doaa(GLuint outfbo, void (*resolve)(GLuint, int));
+bool debugaa();
+void cleanupaa();
+
+void setaamask(bool val);
+void enableaamask(int stencil = 0);
+void disableaamask();
+
+bool maskedaa();
+bool multisampledaa();
+
+#endif
diff --git a/src/engine/engine.hh b/src/engine/engine.hh
index f0e7bf8..eb7582a 100644
--- a/src/engine/engine.hh
+++ b/src/engine/engine.hh
@@ -364,21 +364,6 @@ extern bool useavatarmask();
 extern void enableavatarmask();
 extern void disableavatarmask();
 
-// aa
-extern matrix4 nojittermatrix;
-
-extern void setupaa(int w, int h);
-extern void jitteraa();
-extern bool maskedaa();
-extern bool multisampledaa();
-extern void setaavelocityparams(GLenum tmu = GL_TEXTURE0);
-extern void setaamask(bool val);
-extern void enableaamask(int stencil = 0);
-extern void disableaamask();
-extern void doaa(GLuint outfbo, void (*resolve)(GLuint, int));
-extern bool debugaa();
-extern void cleanupaa();
-
 // ents
 extern char *entname(entity &e);
 extern bool haveselent();
diff --git a/src/engine/rendergl.cc b/src/engine/rendergl.cc
index 21bd7cb..9ecac2a 100644
--- a/src/engine/rendergl.cc
+++ b/src/engine/rendergl.cc
@@ -1,5 +1,7 @@
 // rendergl.cpp: core opengl rendering stuff
 
+#include "aa.hh"
+
 #include "engine.hh"
 
 bool hasVAO = false, hasTR = false, hasTSW = false, hasPBO = false, hasFBO = false, hasAFBO = false, hasDS = false, hasTF = false, hasCBF = false, hasS3TC = false, hasFXT1 = false, hasLATC = false, hasRGTC = false, hasAF = false, hasFBB = false, hasFBMS = false, hasTMS = false, hasMSS = false, hasFBMSBS = false, hasUBO = false, hasMBR = false, hasDB2 = false, hasDBB = false, hasTG = false, hasTQ = false, hasPF = false, hasTRG = false, hasTI = false, hasHFV = false, hasHFP = false, hasDBT = false, hasDC = false, hasDBGO = false, hasEGPU4 = false, hasGPU4 = false, hasGPU5 = false, hasBFE = false, hasEAL = false, hasCR = false, hasOQ2 = false, hasES3 = false, hasCB = false, hasCI = false;
diff --git a/src/engine/renderlights.cc b/src/engine/renderlights.cc
index a6b9a82..c6a0155 100644
--- a/src/engine/renderlights.cc
+++ b/src/engine/renderlights.cc
@@ -1,3 +1,5 @@
+#include "aa.hh"
+
 #include "engine.hh"
 
 int gw = -1, gh = -1, bloomw = -1, bloomh = -1, lasthdraccum = 0;
diff --git a/src/engine/rendermodel.cc b/src/engine/rendermodel.cc
index fd995d6..ac60078 100644
--- a/src/engine/rendermodel.cc
+++ b/src/engine/rendermodel.cc
@@ -1,3 +1,5 @@
+#include "aa.hh"
+
 #include "engine.hh"
 
 VAR(oqdynent, 0, 1, 1);
diff --git a/src/meson.build b/src/meson.build
index e31e894..35e5054 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,5 +1,5 @@
 octacore_includes = [
-    include_directories('shared', 'engine', 'game', 'enet/include')
+    include_directories('.', 'shared', 'engine', 'game', 'enet/include')
 ]
 
 # FIXME: remove, for now without this the engine behaves wonky
diff --git a/src/shared/cube.hh b/src/shared/cube.hh
index 40edd08..2860b86 100644
--- a/src/shared/cube.hh
+++ b/src/shared/cube.hh
@@ -36,18 +36,7 @@
   #define ZLIB_DLL
 #endif
 
-#ifndef STANDALONE
-  #ifdef __APPLE__
-    #include "SDL2/SDL.h"
-    #define GL_GLEXT_LEGACY
-    #define __glext_h_
-    #include <OpenGL/gl.h>
-    #define main SDL_main
-  #else
-    #include <SDL.h>
-    #include <SDL_opengl.h>
-  #endif
-#endif
+#include "gl.hh"
 
 #include <enet/enet.h>
 
diff --git a/src/shared/geom.hh b/src/shared/geom.hh
index 840735c..ee19054 100644
--- a/src/shared/geom.hh
+++ b/src/shared/geom.hh
@@ -1,3 +1,6 @@
+#ifndef GEOM_HH
+#define GEOM_HH
+
 struct vec;
 struct vec4;
 
@@ -1940,3 +1943,4 @@ static inline float sin360(int angle) { return sincos360[angle].y; }
 static inline float tan360(int angle) { const vec2 &sc = sincos360[angle]; return sc.y/sc.x; }
 static inline float cotan360(int angle) { const vec2 &sc = sincos360[angle]; return sc.x/sc.y; }
 
+#endif
diff --git a/src/shared/gl.hh b/src/shared/gl.hh
new file mode 100644
index 0000000..0defaff
--- /dev/null
+++ b/src/shared/gl.hh
@@ -0,0 +1,17 @@
+#ifndef GL_HH
+#define GL_HH
+
+#ifndef STANDALONE
+#  ifdef __APPLE__
+#    include "SDL2/SDL.h"
+#    define GL_GLEXT_LEGACY
+#    define __glext_h_
+#    include <OpenGL/gl.h>
+#    define main SDL_main
+#  else
+#    include <SDL.h>
+#    include <SDL_opengl.h>
+#  endif
+#endif
+
+#endif
diff --git a/src/shared/tools.hh b/src/shared/tools.hh
index 8c9f8fa..7b28c6a 100644
--- a/src/shared/tools.hh
+++ b/src/shared/tools.hh
@@ -3,6 +3,9 @@
 #ifndef _TOOLS_H
 #define _TOOLS_H
 
+#include <zlib.h>
+#include <enet/enet.h>
+
 #ifdef NULL
 #undef NULL
 #endif