Symptom:

Startup of termux-x11 produces a series of xkbcomp warnings:

'''
The XKEYBOARD keymap compiler (xkbcomp) reports:

Warning: Could not resolve keysym XF86OK
...
Errors from xkbcomp are not fatal to the X server
'''

Root Cause:

The application appears to be compiled with DFLT_XKB_CONFIG_ROOT set to /. This was identified in the source code file app/src/main/cpp/recipes/xkbcomp.cmake:

target_compile_options(xkbcomp PRIVATE ... "-DDFLT_XKB_CONFIG_ROOT=\\"/\\"" ...)

This hardcoded default path prevents the embedded xkbcomp from locating the keymap files at their correct location (/data/data/com.termux/files/usr/share/X11/xkb).

Solution:

A system-level fix is to modify the launch script at /data/data/com.termux/files/usr/bin/termux-x11 to set the correct environment variable before the application executes.

Adding the following line to the top of the script resolves all warnings:

export XKB_CONFIG_ROOT=/data/data/com.termux/files/usr/share/X11/xkb

Modified Script:

sh
#!/data/data/com.termux/files/usr/bin/sh
export XKB_CONFIG_ROOT=/data/data/com.termux/files/usr/share/X11/xkb

[ -z "${LD_LIBRARY_PATH+x}" ] || export XSTARTUP_LD_LIBRARY_PATH="$LD_LIBRARY_PATH"
[ -z "${LD_PRELOAD+x}" ] || export XSTARTUP_LD_PRELOAD="$LD_PRELOAD"
# ... (rest of script)

This provides a system-wide solution without requiring user-specific configuration changes.