null nadir

Thanks Benedikt. I wasn't expecting so many 'include' options. How are the correct header files identified amidst numerous options? What would indicate 8051 (EM85F684A) relevant options?

Hi, I'm a new sdcc user: 1) running Debian 10(Buster). 2) sdcc -v : mcs51/z80/z180/r2k/r2ka/r3ka/sm83/tlcs90/ez80_z80/z80n/ds390/pic16/pic14/TININative/ds400/hc08/s08/stm8/pdk13/pdk14/pdk15/mos6502 4.2.2 #13420 (Linux). 3) Target: Pinephone keyboard mcu EM85F684A (8 bit 8051 instruction set). When I compile (sdcc -mmcs51 i2c-flasher.c) I get error: In file included from i2c-flasher.c:20: common.c:3:19: fatal error: fcntl.h: No such file or directory compilation terminated." find shows I have numerous...