I wrote it like that because I thought you were on one of your Macintoshes. 
"(qb64pepath)" is the directory where you copied the QB64PE files into, before building the "qb64pe" executable.
So from there, it's the "internal" child directory, and the "config.ini" that is a member of that "internal".
If it fails then you could erase everything in the QB64PE directory as you copied it, and try again to unpack the compressed archive and rebuild "qb64pe" executable. Make sure you backed up your valuable source code and library files first!
One more thing you could try is to download the "official" QB64 v2.1, and try to install and build that.
This is an error you're getting that I've never seen. I tried a lot of distros although my list isn't comprehensive, I have actually held back from installing QB64PE from a few of them, such as Slackware 32-bit because I want 64-bit programs out of it.
What Linux distro are you using? You should use and install from an ISO which was created in 2022 and later.
EDIT: I looked into the source file giving the error, but line #18218 has a variable being implicitly declared and assigned for the first time. Might have to get rid also of "(qb64pepath)/internal/temp/recent.bin". As ridiculous as it sounds, that file might indicate a file that no longer exists in the system, or a strange character that the QB64 IDE is choking on. (shrugs)
"(qb64pepath)" is the directory where you copied the QB64PE files into, before building the "qb64pe" executable.
So from there, it's the "internal" child directory, and the "config.ini" that is a member of that "internal".
If it fails then you could erase everything in the QB64PE directory as you copied it, and try again to unpack the compressed archive and rebuild "qb64pe" executable. Make sure you backed up your valuable source code and library files first!
One more thing you could try is to download the "official" QB64 v2.1, and try to install and build that.
This is an error you're getting that I've never seen. I tried a lot of distros although my list isn't comprehensive, I have actually held back from installing QB64PE from a few of them, such as Slackware 32-bit because I want 64-bit programs out of it.
What Linux distro are you using? You should use and install from an ISO which was created in 2022 and later.
EDIT: I looked into the source file giving the error, but line #18218 has a variable being implicitly declared and assigned for the first time. Might have to get rid also of "(qb64pepath)/internal/temp/recent.bin". As ridiculous as it sounds, that file might indicate a file that no longer exists in the system, or a strange character that the QB64 IDE is choking on. (shrugs)