Compiling Qt application - error: linux/errno.h: No such file

[excalamus]

I'm a Python developer familiar with PySide/PyQt teaching myself how to use Qt 
with C++ and following a tutorial on how to compile a Qt application without 
QtCreator 
(https://www.linux.org/threads/c-tutorial-create-qt-applications-without-qtcreator.18409/).
  

I've installed what I believe are the necessary Guix packages: gcc (for g++), 
make, qtbase (for qmake and qtwidgets), and qtdeclarative (because the tutorial 
uses that later on).  When trying to compile the basic main window I get the 
following error:

g++ -c -pipe -O2 -Wall -Wextra -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS 
-DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -I. 
-I../../.guix-profile/include/qt5 -I../../.guix-profile/include/qt5/QtWidgets 
-I../../.guix-profile/include/qt5/QtGui 
-I../../.guix-profile/include/qt5/QtCore -I. 
-I/gnu/store/m5l6pwzlk3909n9cka9c9qlk7f0lqbig-libdrm-2.4.103/include/libdrm 
-I../../.guix-profile/lib/qt5/mkspecs/linux-g++ -o main.o main.cpp
In file included from 
/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/include/errno.h:28,
                 from 
/gnu/store/jc90jrkd40az0zggw84s3ax6m351jlkg-gcc-10.3.0/include/c++/cerrno:42,
                 from 
/gnu/store/jc90jrkd40az0zggw84s3ax6m351jlkg-gcc-10.3.0/include/c++/ext/string_conversions.h:44,
                 from 
/gnu/store/jc90jrkd40az0zggw84s3ax6m351jlkg-gcc-10.3.0/include/c++/bits/basic_string.h:6545,
                 from 
/gnu/store/jc90jrkd40az0zggw84s3ax6m351jlkg-gcc-10.3.0/include/c++/string:55,
                 from ../../.guix-profile/include/qt5/QtCore/qbytearray.h:52,
                 from ../../.guix-profile/include/qt5/QtCore/qstring.h:50,
                 from ../../.guix-profile/include/qt5/QtCore/qobject.h:47,
                 from 
../../.guix-profile/include/qt5/QtCore/qabstractanimation.h:43,
                 from ../../.guix-profile/include/qt5/QtCore/QtCore:6,
                 from 
../../.guix-profile/include/qt5/QtWidgets/QtWidgetsDepends:3,
                 from ../../.guix-profile/include/qt5/QtWidgets/QtWidgets:3,
                 from main.cpp:2:
/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/include/bits/errno.h:26:11:
 fatal error: linux/errno.h: No such file or directory
   26 | # include <linux/errno.h>
      |           ^~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:1191: main.o] Error 1

If I'm reading the error output correctly, the error occurs when trying to 
compile the main.cpp object file which uses includes the QtWidgets module.  The 
error is in that portion of the source, so I don't think there's anything I 
could comment out from the makefile.

Browsing the documentation for glibc, it looks like linux/errno.h is a glibc 
extension.  Is that not included in the Guix glibc package?  I don't see 
another Guix package for glibc extensions.