Fixed configure/Makefile to work without patches in OpenBSD.

Changes.txt

@@ -1,17 +1,28 @@
 ===========================================================================
-
-     SSSS    tt          lll  lll
-    SS  SS   tt           ll   ll
-    SS     tttttt  eeee   ll   ll   aaaa
-     SSSS    tt   ee  ee  ll   ll      aa
-        SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
-    SS  SS   tt   ee      ll   ll  aa  aa
-     SSSS     ttt  eeeee llll llll  aaaaa
-
-===========================================================================
-                              Release History
-===========================================================================
-
+
+     SSSS    tt          lll  lll
+    SS  SS   tt           ll   ll
+    SS     tttttt  eeee   ll   ll   aaaa
+     SSSS    tt   ee  ee  ll   ll      aa
+        SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
+    SS  SS   tt   ee      ll   ll  aa  aa
+     SSSS     ttt  eeeee llll llll  aaaaa
+
+===========================================================================
+                              Release History
+===========================================================================
+
+5.1.2 to 5.1.3: (MMM d, 2018)
+
+  * Fixed crash in OpenBSD when quitting the app, which can also be
+    happening on other systems (no reports yet, but the problem is now
+    fixed for good).
+
+  * Fixed configure/build scripts to work natively under OpenBSD.
+
+-Have fun!
+
+
 5.1.1 to 5.1.2: (May 20, 2018)
 
   * Fixed bug with SaveKey autodetection; some ROMs were not correctly
@@ -22,8 +33,6 @@
 
   * Fixed bug in UI navigation with joystick hat movement.
 
--Have fun!
-
 
 5.1 to 5.1.1: (February 21, 2018)
 

Makefile

@@ -147,7 +147,7 @@ CXX_UPDATE_DEP_FLAG = -Wp,-MMD,"$(*D)/$(DEPDIR)/$(*F).d2"
 
 .c.o:
 	$(MKDIR) $(*D)/$(DEPDIR)
-	$(CXX) $(CXX_UPDATE_DEP_FLAG) $(CXXFLAGS) $(CPPFLAGS) -c $(<) -o $*.o
+	$(CC) $(CXX_UPDATE_DEP_FLAG) $(CXXFLAGS) $(CPPFLAGS) -c $(<) -o $*.o
 	$(ECHO) "$(*D)/" > $(*D)/$(DEPDIR)/$(*F).d
 	$(CAT) "$(*D)/$(DEPDIR)/$(*F).d2" >> "$(*D)/$(DEPDIR)/$(*F).d"
 	$(RM) "$(*D)/$(DEPDIR)/$(*F).d2"
@@ -162,7 +162,7 @@ else
 
 .c.o:
 	$(MKDIR) $(*D)/$(DEPDIR)
-	$(CXX) $(CXX_UPDATE_DEP_FLAG) $(CXXFLAGS) $(CPPFLAGS) -c $(<) -o $*.o
+	$(CC) $(CXX_UPDATE_DEP_FLAG) $(CXXFLAGS) $(CPPFLAGS) -c $(<) -o $*.o
 endif
 
 # Include the dependency tracking files. We add /dev/null at the end

configure

@@ -574,7 +574,7 @@ if test "$_libpng" = auto ; then
 #include <png.h>
 int main(void) { return printf("%s\n", PNG_HEADER_VERSION_STRING); }
 EOF
-	cc_check $LDFLAGS $CXXFLAGS $LIBPNG_CFLAGS $LIBPNG_LIBS -lpng && _libpng=yes
+	cc_check $LDFLAGS $CXXFLAGS $LIBPNG_CFLAGS $LIBPNG_LIBS `pkg-config --libs libpng` && _libpng=yes
 fi
 if test "$_libpng" = yes ; then
   _zlib=auto