diff --git a/source/build/include/compat.h b/source/build/include/compat.h
index f1ce512f0..85e7eb29e 100644
--- a/source/build/include/compat.h
+++ b/source/build/include/compat.h
@@ -12,17 +12,6 @@
 #include "intvec.h"
 #include "m_swap.h"
 
-////////// Compiler detection //////////
-
-#ifdef __GNUC__
-# define EDUKE32_GCC_PREREQ(major, minor) (major < __GNUC__ || (major == __GNUC__ && minor <= __GNUC_MINOR__))
-#else
-# define EDUKE32_GCC_PREREQ(major, minor) 0
-#endif
-
-
-////////// Language detection //////////
-
 ////////// Language and compiler feature polyfills //////////
 
 # define EXTERNC
diff --git a/source/build/src/engine.cpp b/source/build/src/engine.cpp
index ac425c089..1d9275964 100644
--- a/source/build/src/engine.cpp
+++ b/source/build/src/engine.cpp
@@ -198,40 +198,6 @@ int32_t renderAddTsprite(int16_t z, int16_t sectnum)
 }
 
 
-//
-// wallfront (internal)
-//
-int32_t wallfront(int32_t l1, int32_t l2)
-{
-    vec2_t const l1vect   = wall[thewall[l1]].pos;
-    vec2_t const l1p2vect = wall[wall[thewall[l1]].point2].pos;
-    vec2_t const l2vect   = wall[thewall[l2]].pos;
-    vec2_t const l2p2vect = wall[wall[thewall[l2]].point2].pos;
-    vec2_t d = { l1p2vect.x - l1vect.x, l1p2vect.y - l1vect.y };
-    int32_t t1 = DMulScale(l2vect.x-l1vect.x, d.y, -d.x, l2vect.y-l1vect.y, 2); //p1(l2) vs. l1
-    int32_t t2 = DMulScale(l2p2vect.x-l1vect.x, d.y, -d.x, l2p2vect.y-l1vect.y, 2); //p2(l2) vs. l1
-
-    if (t1 == 0) { if (t2 == 0) return -1; t1 = t2; }
-    if (t2 == 0) t2 = t1;
-
-    if ((t1^t2) >= 0) //pos vs. l1
-        return (DMulScale(globalposx-l1vect.x, d.y, -d.x, globalposy-l1vect.y, 2) ^ t1) >= 0;
-
-    d.x = l2p2vect.x-l2vect.x;
-    d.y = l2p2vect.y-l2vect.y;
-
-    t1 = DMulScale(l1vect.x-l2vect.x, d.y, -d.x, l1vect.y-l2vect.y, 2); //p1(l1) vs. l2
-    t2 = DMulScale(l1p2vect.x-l2vect.x, d.y, -d.x, l1p2vect.y-l2vect.y, 2); //p2(l1) vs. l2
-
-    if (t1 == 0) { if (t2 == 0) return -1; t1 = t2; }
-    if (t2 == 0) t2 = t1;
-
-    if ((t1^t2) >= 0) //pos vs. l2
-        return (DMulScale(globalposx-l2vect.x,d.y,-d.x,globalposy-l2vect.y, 2) ^ t1) < 0;
-
-    return -2;
-}
-
 //
 // animateoffs (internal)
 //
diff --git a/source/build/src/engine_priv.h b/source/build/src/engine_priv.h
index 3210d04d5..533c120ba 100644
--- a/source/build/src/engine_priv.h
+++ b/source/build/src/engine_priv.h
@@ -41,7 +41,6 @@ extern int16_t numscans, numbunches;
 
 
 // int32_t wallmost(int16_t *mostbuf, int32_t w, int32_t sectnum, char dastat);
-int32_t wallfront(int32_t l1, int32_t l2);
 
 void set_globalang(fixed_t const ang);
 
diff --git a/source/build/src/polymost.cpp b/source/build/src/polymost.cpp
index 8ca354f79..9c1ee60cf 100644
--- a/source/build/src/polymost.cpp
+++ b/source/build/src/polymost.cpp
@@ -1776,6 +1776,41 @@ static void polymost_drawalls(int32_t const bunch)
     }
 }
 
+//
+// wallfront (internal)
+//
+int32_t wallfront(int32_t l1, int32_t l2)
+{
+    vec2_t const l1vect = wall[thewall[l1]].pos;
+    vec2_t const l1p2vect = wall[wall[thewall[l1]].point2].pos;
+    vec2_t const l2vect = wall[thewall[l2]].pos;
+    vec2_t const l2p2vect = wall[wall[thewall[l2]].point2].pos;
+    vec2_t d = { l1p2vect.x - l1vect.x, l1p2vect.y - l1vect.y };
+    int32_t t1 = DMulScale(l2vect.x - l1vect.x, d.y, -d.x, l2vect.y - l1vect.y, 2); //p1(l2) vs. l1
+    int32_t t2 = DMulScale(l2p2vect.x - l1vect.x, d.y, -d.x, l2p2vect.y - l1vect.y, 2); //p2(l2) vs. l1
+
+    if (t1 == 0) { if (t2 == 0) return -1; t1 = t2; }
+    if (t2 == 0) t2 = t1;
+
+    if ((t1 ^ t2) >= 0) //pos vs. l1
+        return (DMulScale(globalposx - l1vect.x, d.y, -d.x, globalposy - l1vect.y, 2) ^ t1) >= 0;
+
+    d.x = l2p2vect.x - l2vect.x;
+    d.y = l2p2vect.y - l2vect.y;
+
+    t1 = DMulScale(l1vect.x - l2vect.x, d.y, -d.x, l1vect.y - l2vect.y, 2); //p1(l1) vs. l2
+    t2 = DMulScale(l1p2vect.x - l2vect.x, d.y, -d.x, l1p2vect.y - l2vect.y, 2); //p2(l1) vs. l2
+
+    if (t1 == 0) { if (t2 == 0) return -1; t1 = t2; }
+    if (t2 == 0) t2 = t1;
+
+    if ((t1 ^ t2) >= 0) //pos vs. l2
+        return (DMulScale(globalposx - l2vect.x, d.y, -d.x, globalposy - l2vect.y, 2) ^ t1) < 0;
+
+    return -2;
+}
+
+
 static int32_t polymost_bunchfront(const int32_t b1, const int32_t b2)
 {
     int b1f = bunchfirst[b1];