Install the Language Tools

When you install MPLAB X IDE, the following language tools are installed: MPASM toolchain.

In addition, the following C compiler toolchains (compiler, assembler, linker, etc.) can be used with MPLAB X IDE. To select a compiler toolchain, consider which device you wish to use and then choose a toolchain that supports that device.

MPLAB XC C Compilers
AVR and Arm C Compilers
AVRASM2 - installed with Atmel Studio

MPLAB XC compilers can be licensed as Free or PRO (full-featured, code-optimized) compilers. To install and license these compilers, view the document Installing and Licensing MPLAB XC C Compilers (DS50002059). MPLAB X IDE includes the option to license your installed compiler and roam in and out for network licenses. See Tools>Licenses.

AVR and Arm GNU C compilers (GCCs) are always free. Follow the installer screens to install on you computer.

Note: Ensure these compilers are installed where MPLAB X IDE can search for them, e.g., where MPLAB XC C compilers are installed under C:\Program Files\Microchip. Otherwise you will have to specify in MPLAB X IDE where to find them (see Set Language Tool Locations).