0.1.5: build fails with X server 21.0.99.1

make[3]: Entering directory '/home/tkloczko/rpmbuild/BUILD/xf86-video-qxl-0.1.5/src'
/bin/sh ../libtool  --tag=CC   --mode=compile /usr/bin/gcc -DHAVE_CONFIG_H -I. -I..    -I/usr/include/spice-1  -I/usr/include/xorg -fvisibility=hidden -I/usr/include/pixman-1 -I/usr/include/X11/dri   -fno-strict-aliasing -I/usr/include/libdrm   -O2 -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fdata-sections -ffunction-sections -flto=auto -flto-partition=none -c -o qxl_option_helpers.lo qxl_option_helpers.c
libtool: compile:  /usr/bin/gcc -DHAVE_CONFIG_H -I. -I.. -I/usr/include/spice-1 -I/usr/include/xorg -fvisibility=hidden -I/usr/include/pixman-1 -I/usr/include/X11/dri -fno-strict-aliasing -I/usr/include/libdrm -O2 -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fdata-sections -ffunction-sections -flto=auto -flto-partition=none -c qxl_option_helpers.c  -fPIC -DPIC -o .libs/qxl_option_helpers.o
qxl_option_helpers.c: In function ‘get_bool_option’:
qxl_option_helpers.c:37:44: error: ‘ValueUnion’ has no member named ‘bool’; did you mean ‘boolean’?
   37 |         return options[option_index].value.bool;
      |                                            ^~~~
      |                                            boolean
make[3]: *** [Makefile:797: qxl_option_helpers.lo] Error 1