diff --git a/src/machine/machine.h b/src/machine/machine.h
index c01ebed55..38c1da3b5 100644
--- a/src/machine/machine.h
+++ b/src/machine/machine.h
@@ -122,8 +122,12 @@ extern void	machine_at_p55tvp4_init(machine_t *);
 extern void	machine_at_i430vx_init(machine_t *);
 extern void	machine_at_p55va_init(machine_t *);
 
+#ifdef DEV_BRANCH
+#ifdef USE_I686
 extern void	machine_at_i440fx_init(machine_t *);
 extern void	machine_at_s1668_init(machine_t *);
+#endif
+#endif
 extern void	machine_at_ali1429_init(machine_t *);
 extern void	machine_at_cmdpc_init(machine_t *);
 
@@ -138,9 +142,11 @@ extern void	machine_at_r418_init(machine_t *);
 
 extern void	machine_at_wd76c10_init(machine_t *);
 
-#ifdef GREENB
+#ifdef DEV_BRANCH
+#ifdef USE_GREENB
 extern void	machine_at_4gpv31_init(machine_t *);
 #endif
+#endif
 
 extern void	machine_pcjr_init(machine_t *);
 
diff --git a/src/rom.c b/src/rom.c
index 90c92306d..b8f48b746 100644
--- a/src/rom.c
+++ b/src/rom.c
@@ -13,7 +13,7 @@
  *		- c386sx16 BIOS fails checksum
  *		- the loadfont() calls should be done elsewhere
  *
- * Version:	@(#)rom.c	1.0.25	2018/01/01
+ * Version:	@(#)rom.c	1.0.26	2018/01/01
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -409,7 +409,8 @@ rom_load_bios(int rom_id)
 		biosmask = 0x7fff;
 		return(1);
 
-#ifdef PORTABLE3
+#ifdef DEV_BRANCH
+#ifdef USE_PORTABLE3
 	case ROM_PORTABLEIII:
 	case ROM_PORTABLEIII386:
 		if (rom_load_interleaved(
@@ -417,6 +418,7 @@ rom_load_bios(int rom_id)
 			L"roms/machines/portableiii/109737-002.bin",
 			0x000000, 65536, 0, rom)) return(1);
 		break;
+#endif
 #endif
 
 	case ROM_DTKXT:
@@ -574,7 +576,8 @@ rom_load_bios(int rom_id)
 		biosmask = 0x1ffff;
 		return(1);
 
-#ifdef PORTABLE3
+#ifdef DEV_BRANCH
+#ifdef USE_PORTABLE3
 	case ROM_DESKPRO_386:
 		if (! rom_load_interleaved(
 			L"roms/machines/deskpro386/109592-005.u11.bin",
@@ -582,6 +585,7 @@ rom_load_bios(int rom_id)
 			0x000000, 32768, 0, rom)) break;
 		biosmask = 0x7fff;
 		return(1);
+#endif
 #endif
 
 	case ROM_AMIXT:
@@ -817,12 +821,14 @@ rom_load_bios(int rom_id)
 		biosmask = 0x1ffff;
 		return(1);
 
-#ifdef GREENB
+#ifdef DEV_BRANCH
+#ifdef USE_GREENB
 	case ROM_4GPV31:
 		if (! rom_load_linear(
 			L"roms/machines/green-b/4gpv31-ami-1993-8273517.bin",
 			0x000000, 65536, 0, rom)) break;
 		return(1);
+#endif
 #endif
 
 	case ROM_T3100E:
diff --git a/src/win/Makefile.mingw b/src/win/Makefile.mingw
index 390830cc4..9686ccd6b 100644
--- a/src/win/Makefile.mingw
+++ b/src/win/Makefile.mingw
@@ -8,7 +8,7 @@
 #
 #		Makefile for Win32 (MinGW32) environment.
 #
-# Version:	@(#)Makefile.mingw	1.0.88	2018/01/01
+# Version:	@(#)Makefile.mingw	1.0.89	2018/01/01
 #
 # Authors:	Miran Grca, <mgrca8@gmail.com>
 #               Fred N. van Kempen, <decwiz@yahoo.com>
@@ -310,6 +310,7 @@ endif
 
 ifeq ($(GREENB), y)
 OPTS		+= -DUSE_GREENB
+DEVROBJ		+ m_at_4gpv31.o
 endif
 
 ifeq ($(I686), y)
@@ -378,7 +379,6 @@ MCHOBJ		:= machine.o machine_table.o \
 		    m_at_sis_85c471.o m_at_sis_85c496.o \
 		    m_at_430lx_nx.o m_at_430fx.o \
 		    m_at_430hx.o m_at_430vx.o \
-		    m_at_4gpv31.o \
 		    m_pcjr.o m_ps1.o m_ps2_isa.o m_ps2_mca.o
 
 DEVOBJ		:= bugger.o lpt.o $(SERIAL) \