J :

* Blind attempt (PSP SDK not installed here, can't tell, will test tonight) at
  fixing the 1xx/3xx mismatch build bug.

JGE/Makefile

@@ -51,13 +51,13 @@ ifeq ($(MAKECMDGOALS),3xx)
 DEFAULT_RULE = 3xx
 TARGET_ARCHITECTURE = psp
 TARGET_LIB = libjge300.a
+CXXFLAGS += -DDEVHOOK -DPSPFW3XX
 endif
 ifeq ($(MAKECMDGOALS),1xx)
 DEFAULT_RULE = 1xx
 OBJS = $(GENERIC_OBJS) $(PSP_OBJS)
 TARGET_LIB = libjge100.a
 TARGET_ARCHITECTURE = psp
-CXXFLAGS += -DDEVHOOK -DPSPFW3XX
 endif
 
 ifeq ($(TARGET_ARCHITECTURE),psp)
@@ -80,8 +80,8 @@ LIBDIR = lib/linux
 endif
 
 # Set definitive values for variables.
-CXXFLAGS := $(INCDIR) $(CXXFLAGS)
-LDFLAGS := $(LIBS)
+CXXFLAGS += $(INCDIR)
+LDFLAGS = $(LIBS)
 TARGET_LIB := $(LIBDIR)/$(TARGET_LIB)
 TARGET_HGE := $(LIBDIR)/$(TARGET_HGE)