Si, si. Ya hice todo lo que indicáis. De hecho, estoy con otro proyecto y tambien me falla en lo mismo. Paso el output completo a ver si se os ocurre algo:
make -f nbproject/Makefile-default.mk SUBPROJECTS= .build-conf
make[1]: Entering directory 'C:/Users/Multilifts/MPLABXProjects/Prueba_UART.X'
make -f nbproject/Makefile-default.mk dist/default/production/Prueba_UART.X.production.hex
make[2]: Entering directory 'C:/Users/Multilifts/MPLABXProjects/Prueba_UART.X'
"C:\Program Files (x86)\Microchip\xc8\v1.44\bin\xc8.exe" --pass1 --chip=18F2480 -Q -G --double=24 --float=24 --emi=wordwrite --opt=+asm,+asmfile,-speed,+space,-debug,-local --addrqual=ignore --mode=free -P -N255 --warn=-3 --asmlist -DXPRJ_default=default --summary=default,-psect,-class,+mem,-hex,-file --output=default,-inhx032 --runtime=default,+clear,+init,-keep,-no_startup,-download,+config,+clib,+plib --output=-mcof,+elf:multilocs --stack=compiled:auto:auto:auto "--errformat=%f:%l: error: (%n) %s" "--warnformat=%f:%l: warning: (%n) %s" "--msgformat=%f:%l: advisory: (%n) %s" -obuild/default/production/PruebaSerie.p1 PruebaSerie.c
"C:\Program Files (x86)\Microchip\xc8\v1.44\bin\xc8.exe" --chip=18F2480 -G -mdist/default/production/Prueba_UART.X.production.map --double=24 --float=24 --emi=wordwrite --opt=+asm,+asmfile,-speed,+space,-debug,-local --addrqual=ignore --mode=free -P -N255 --warn=-3 --asmlist -DXPRJ_default=default --summary=default,-psect,-class,+mem,-hex,-file --output=default,-inhx032 --runtime=default,+clear,+init,-keep,-no_startup,-download,+config,+clib,+plib --output=-mcof,+elf:multilocs --stack=compiled:auto:auto:auto "--errformat=%f:%l: error: (%n) %s" "--warnformat=%f:%l: warning: (%n) %s" "--msgformat=%f:%l: advisory: (%n) %s" --memorysummary dist/default/production/memoryfile.xml -odist/default/production/Prueba_UART.X.production.elf build/default/production/PruebaSerie.p1
Microchip MPLAB XC8 C Compiler (Free Mode) V1.44
Build date: Sep 13 2017
Part Support Version: 1.44
Copyright (C) 2017 Microchip Technology Inc.
License type: Node Configuration
:: advisory: (1233) Employing 18F2480 errata work-arounds:
:: advisory: (1234) * Corrupted fast interrupt shadow registers
:: warning: (1273) Omniscient Code Generation not available in Free mode
C:\Program Files (x86)\Microchip\xc8\v1.44\include\pic18f2480.h:30971: error: (1098) conflicting declarations for variable "_TXSTAbits" (C:\Program Files (x86)\Microchip\xc8\v1.44\include\pic18f2480.h:28197)
(908) exit status = 1
nbproject/Makefile-default.mk:131: recipe for target 'dist/default/production/Prueba_UART.X.production.hex' failed
make[2]: Leaving directory 'C:/Users/Multilifts/MPLABXProjects/Prueba_UART.X'
nbproject/Makefile-default.mk:90: recipe for target '.build-conf' failed
make[1]: Leaving directory 'C:/Users/Multilifts/MPLABXProjects/Prueba_UART.X'
nbproject/Makefile-impl.mk:39: recipe for target '.build-impl' failed
make[2]: *** [dist/default/production/Prueba_UART.X.production.hex] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2
BUILD FAILED (exit value 2, total time: 1s)