Arch Linux

Description: xgap cannot be launched.

$ find / -name xgap 2>&-
/usr/lib/gap/pkg/xgap-4.30/bin/x86_64-unknown-linux-gnu-gcc/xgap

$ /usr/lib/gap/pkg/xgap-4.30/bin/x86_64-unknown-linux-gnu-gcc/xgap
Panic: cannot establish communication with gap.%

$ gap
┌───────┐ GAP 4.10.2 of 19-Jun-2019
│ GAP │ https://www.gap-system.org
└───────┘ Architecture: x86_64-pc-linux-gnu-default64-kv3
Configuration: gmp 6.1.2, readline
Loading the library and packages ...
Packages: AClib 1.3.1, Alnuth 3.1.1, AtlasRep 2.1.0, AutoDoc 2019.05.20, AutPGrp 1.10, Browse 1.8.8, Carat 2.2.3, CRISP 1.4.4, Cryst 4.1.19, CrystCat 1.1.9,
CTblLib 1.2.2, FactInt 1.6.2, FGA 1.4.0, Forms 1.2.5, GAPDoc 1.6.2, genss 1.6.5, IO 4.6.0, IRREDSOL 1.4, LAGUNA 3.9.3, orb 4.8.2, Polenta 1.3.8,
Polycyclic 2.14, PrimGrp 3.3.2, RadiRoot 2.8, recog 1.3.2, ResClasses 4.7.2, SmallGrp 1.3, Sophus 1.24, SpinSym 1.5.1, TomLib 1.2.8, TransGrp 2.0.4,
utils 0.63
Try '??help' for help. See also '?copyright', '?cite' and '?authors'
gap> LoadPackage("xgap");
#I XGAP package is not available. To see further details, enter
#I SetInfoLevel(InfoPackageLoading,4); and try to load the package again.
fail
gap> SetInfoLevel(InfoPackageLoading,4);
gap> LoadPackage("xgap");
#I XGAP: entering LoadPackage
#I XGAP: PackageAvailabilityInfo for version 4.30
#I XGAP: PackageAvailabilityInfo: the AvailabilityTest function returned false
#I XGAP: PackageAvailabilityInfo: no installed version fits
#I XGAP: return from LoadPackage, package is not available
fail
gap>

Additional info:
gap 4.10.2-3
gap-packages 4.10.2-3