Kraft can't configure app-helloworld-cpp

[albertoZurini]

Describe the bug
Kraft can't configure the app-helloworld-cpp.

To Reproduce
Steps to reproduce the behavior:

1. Create folder structure
2. Clone app-helloworld-cpp
3. Clone all the libraries needed
4. Run kraft configure -p kvm -m x86_64
5. Get the error: make: Entering directory '/home/alberto/test/unikraft' Makefile:179: *** Path to external library "../../libs/libunwind" (L) is not absolute. Stop. make: Leaving directory '/home/alberto/test/unikraft' [CRITICAL] Could not configure application

Expected behavior
Kraft should configure with no errors. It indeed configure the app-helloworld with no errors, but can't configure the app-helloworld-cpp.

Desktop (please complete the following information):

• OS: Arch Linux
• Version 5.19.13-arch1-g14-3
• gcc version 12.2.0 (GCC)
• /etc/os-release: NAME="Arch Linux" PRETTY_NAME="Arch Linux" ID=arch BUILD_ID=rolling ANSI_COLOR="38;2;23;147;209" HOME_URL="https://archlinux.org/" DOCUMENTATION_URL="https://wiki.archlinux.org/" SUPPORT_URL="https://bbs.archlinux.org/" BUG_REPORT_URL="https://bugs.archlinux.org/" PRIVACY_POLICY_URL="https://terms.archlinux.org/docs/privacy-policy/" LOGO=archlinux-logo
• GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu)
• Python 3.10.8
• kraft, version 0.5.0.dev491
• QEMU emulator version 7.1.0

[razvand]

@albertoZurini , 5 hackathon points awarded.