Fixed UNIX path bug 🐛
**Describe the bug** 🐛
The hpx program fails to read path and thus is unable to run nim for compilation.

**To Reproduce** 👨‍🔬
1) Use a UNIX machine
2) attempt ``hpx build`` on examples/todo

**Expected behavior** 🤔
No crashes

**Desktop (please complete the following information):** 💻
 - OS: Arch Linux

**Additional context** ✌
🥱
