@Mirdarthos thanks for your help.
I tried to install libpurple-lurch, and got this output:
pamac install libpurple-lurch
Preparing...
Choose optional dependencies for libpurple-lurch:
1: libpurple-carbons: message carbons support
Enter a selection (default=none): 1
Synchronizing package databases...
Error: Failed to prepare transaction: target not found: libpurple-carbons