Cannot build for psp1 platform : "Assembler messages" errors

[pleft]

On an x86 ubuntu machine, I have installed pspdev environment and cannot build libretro core with:
make -f Makefile.libretro platform=psp1

I get error when compiling core/system.c:

psp-gcc -ocore/state.o -c core/state.c -DGIT_VERSION=\"" 5cfd336"\" -G0 -O2 -DNDEBUG  -DUSE_LIBTREMOR -DUSE_LIBCHDR -D_7ZIP_ST -DUSE_LIBRETRO_VFS    -I./libretro/deps/libchdr/include -I./libretro/deps/lzma-19.00/include -I./libretro/deps/zlib-1.2.11 -I./core -I./core/z80 -I./core/m68k -I./core/ntsc -I./core/sound -I./core/input_hw -I./core/cd_hw -I./core/cart_hw -I./core/cart_hw/svp -I./libretro -I./libretro/libretro-common/include  -DUSE_16BPP_RENDERING -DFRONTEND_SUPPORTS_RGB565 -DLSB_FIRST -DBYTE_ORDER=LITTLE_ENDIAN -DPSP -D__LIBRETRO__ -DM68K_OVERCLOCK_SHIFT=20 -DZ80_OVERCLOCK_SHIFT=20 -DHAVE_YM3438_CORE -DHAVE_OPLL_CORE -DMAXROMSIZE=10485760 -DINLINE="static inline"
psp-gcc -ocore/genesis.o -c core/genesis.c -DGIT_VERSION=\"" 5cfd336"\" -G0 -O2 -DNDEBUG  -DUSE_LIBTREMOR -DUSE_LIBCHDR -D_7ZIP_ST -DUSE_LIBRETRO_VFS    -I./libretro/deps/libchdr/include -I./libretro/deps/lzma-19.00/include -I./libretro/deps/zlib-1.2.11 -I./core -I./core/z80 -I./core/m68k -I./core/ntsc -I./core/sound -I./core/input_hw -I./core/cd_hw -I./core/cart_hw -I./core/cart_hw/svp -I./libretro -I./libretro/libretro-common/include  -DUSE_16BPP_RENDERING -DFRONTEND_SUPPORTS_RGB565 -DLSB_FIRST -DBYTE_ORDER=LITTLE_ENDIAN -DPSP -D__LIBRETRO__ -DM68K_OVERCLOCK_SHIFT=20 -DZ80_OVERCLOCK_SHIFT=20 -DHAVE_YM3438_CORE -DHAVE_OPLL_CORE -DMAXROMSIZE=10485760 -DINLINE="static inline"
psp-gcc -ocore/system.o -c core/system.c -DGIT_VERSION=\"" 5cfd336"\" -G0 -O2 -DNDEBUG  -DUSE_LIBTREMOR -DUSE_LIBCHDR -D_7ZIP_ST -DUSE_LIBRETRO_VFS    -I./libretro/deps/libchdr/include -I./libretro/deps/lzma-19.00/include -I./libretro/deps/zlib-1.2.11 -I./core -I./core/z80 -I./core/m68k -I./core/ntsc -I./core/sound -I./core/input_hw -I./core/cd_hw -I./core/cart_hw -I./core/cart_hw/svp -I./libretro -I./libretro/libretro-common/include  -DUSE_16BPP_RENDERING -DFRONTEND_SUPPORTS_RGB565 -DLSB_FIRST -DBYTE_ORDER=LITTLE_ENDIAN -DPSP -D__LIBRETRO__ -DM68K_OVERCLOCK_SHIFT=20 -DZ80_OVERCLOCK_SHIFT=20 -DHAVE_YM3438_CORE -DHAVE_OPLL_CORE -DMAXROMSIZE=10485760 -DINLINE="static inline"
/tmp/cceVUhjA.s: Assembler messages:
/tmp/cceVUhjA.s:162: Error: register value used as expression `lui $16,%hi(eq)'
/tmp/cceVUhjA.s:165: Error: register value used as expression `addiu $4,$16,%lo(eq)'
/tmp/cceVUhjA.s:170: Error: register value used as expression `lui $4,%hi(eq+128)'
/tmp/cceVUhjA.s:172: Error: register value used as expression `addiu $4,$4,%lo(eq+128)'
/tmp/cceVUhjA.s:177: Error: register value used as expression `addiu $16,$16,%lo(eq)'
/tmp/cceVUhjA.s:545: Error: register value used as expression `lui $2,%hi(eq)'
/tmp/cceVUhjA.s:546: Error: register value used as expression `addiu $2,$2,%lo(eq)'
/tmp/cceVUhjA.s:547: Error: register value used as expression `lui $21,%hi(eq+128)'
/tmp/cceVUhjA.s:549: Error: register value used as expression `addiu $2,$21,%lo(eq+128)'
/tmp/cceVUhjA.s:2823: Error: symbol `eq' is already defined
make: *** [Makefile.libretro:875: core/system.o] Error 1

any help is appreciated.