Unable to compile app-helloworld

[szczys]

When typing make from the app-helloworld folder I'm hit with the inability to find gcc (although this is in my path so not sure why):
make: /riscv32-unknown-elf-gcc: Command not found

Adding this line into the apps-sdk/sdk.mk file gets the make process running for a bit:
RISCV_TOOLCHAIN_PATH := /opt/riscv/bin

But then I run into a linker error:

/opt/riscv/lib/gcc/riscv32-unknown-elf/9.2.0/../../../../riscv32-unknown-elf/bin/ld: build//apps-sdk/gloss//crt0.o: in function `.L0 ':
/home/mike/compile/hadbadge2019_fpgasoc/apps-sdk/gloss/crt0.S:20: multiple definition of `_start'; /home/mike/compile/hadbadge2019_fpgasoc/app-helloworld/build/apps-sdk/gloss/crt0.o:/home/mike/compile/hadbadge2019_fpgasoc/apps-sdk/gloss/crt0.S:20: first defined here
collect2: error: ld returned 1 exit status
../apps-sdk/sdk.mk:111: recipe for target 'helloworld.elf' failed
make: *** [helloworld.elf] Error 1

Any idea where I'm going wrong?

[Spritetm]

I blame the incomprehensibleness of gcc linking / not linking against system libs. Should be fixed now, both the issue where the sdk borks with no prefix and the toolchain in $PATH as well as the linker error. Please retry with current master.