Build error on Ubuntu 18.04

[7voxels221]

Any way to fix this?

triTexman.c: In function ‘triNearestColorIndex’:
triTexman.c:820:1: error: unrecognizable insn:
}
^
(insn 237 236 238 37 (set (reg:SI 477)
(if_then_else:SI (ne:CC (reg:CC 67 $fcc0)
(const_int 0 [0]))
(reg/v:SI 281 [ minIndex ])
(reg/v:SI 265 [ minIndex ]))) -1
(nil))
triTexman.c:820:1: internal compiler error: in extract_insn, at recog.c:2202
0x55a60313223a _fatal_insn(char const*, rtx_def const*, char const*, int, char const*)
../../gcc/rtl-error.c:109
0x55a60313226d _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
../../gcc/rtl-error.c:117
0x55a6030ffb83 extract_insn(rtx_def*)
../../gcc/recog.c:2202
0x55a602fca7e9 instantiate_virtual_regs_in_insn
../../gcc/function.c:1559
0x55a602fca7e9 instantiate_virtual_regs
../../gcc/function.c:1925
0x55a602fca7e9 execute
../../gcc/function.c:1975