Attempts to install the Xojo 2018r2 RPM onto a fresh Fedora 28 KDE install fails with that huge list of missing dependencies:
# rpm -iv ./xojo2018r2.rpm
error: Failed dependencies:
ld-linux-armhf.so.3 is needed by xojo2018r2-2018.02-2.x86_64
ld-linux-armhf.so.3(GLIBC_2.4) is needed by xojo2018r2-2018.02-2.x86_64
ld-linux.so.2 is needed by xojo2018r2-2018.02-2.x86_64
ld-linux.so.2(GLIBC_2.3) is needed by xojo2018r2-2018.02-2.x86_64
libX11.so.6 is needed by xojo2018r2-2018.02-2.x86_64
libatk-1.0.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6 is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.0) is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.1) is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.1.3) is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.2) is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.2.4) is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.3) is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.3.3) is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.3.4) is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.4) is needed by xojo2018r2-2018.02-2.x86_64
libc.so.6(GLIBC_2.6) is needed by xojo2018r2-2018.02-2.x86_64
libcairo-gobject.so.2 is needed by xojo2018r2-2018.02-2.x86_64
libcairo.so.2 is needed by xojo2018r2-2018.02-2.x86_64
libdl.so.2 is needed by xojo2018r2-2018.02-2.x86_64
libdl.so.2(GLIBC_2.0) is needed by xojo2018r2-2018.02-2.x86_64
libdl.so.2(GLIBC_2.1) is needed by xojo2018r2-2018.02-2.x86_64
libdl.so.2(GLIBC_2.4) is needed by xojo2018r2-2018.02-2.x86_64
libgcc_s.so.1(GCC_3.0) is needed by xojo2018r2-2018.02-2.x86_64
libgcc_s.so.1(GCC_3.3) is needed by xojo2018r2-2018.02-2.x86_64
libgcc_s.so.1(GCC_4.3.0) is needed by xojo2018r2-2018.02-2.x86_64
libgcc_s.so.1(GLIBC_2.0) is needed by xojo2018r2-2018.02-2.x86_64
libgdk-3.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libgdk_pixbuf-2.0.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libgio-2.0.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libglib-2.0.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libgobject-2.0.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libgthread-2.0.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libgtk-3.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libm.so.6 is needed by xojo2018r2-2018.02-2.x86_64
libm.so.6(GLIBC_2.0) is needed by xojo2018r2-2018.02-2.x86_64
libm.so.6(GLIBC_2.1) is needed by xojo2018r2-2018.02-2.x86_64
libm.so.6(GLIBC_2.2) is needed by xojo2018r2-2018.02-2.x86_64
libm.so.6(GLIBC_2.4) is needed by xojo2018r2-2018.02-2.x86_64
libpango-1.0.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libpangocairo-1.0.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libpthread.so.0 is needed by xojo2018r2-2018.02-2.x86_64
libpthread.so.0(GLIBC_2.0) is needed by xojo2018r2-2018.02-2.x86_64
libpthread.so.0(GLIBC_2.1) is needed by xojo2018r2-2018.02-2.x86_64
libpthread.so.0(GLIBC_2.12) is needed by xojo2018r2-2018.02-2.x86_64
libpthread.so.0(GLIBC_2.2) is needed by xojo2018r2-2018.02-2.x86_64
libpthread.so.0(GLIBC_2.2.3) is needed by xojo2018r2-2018.02-2.x86_64
libpthread.so.0(GLIBC_2.3.2) is needed by xojo2018r2-2018.02-2.x86_64
libpthread.so.0(GLIBC_2.3.3) is needed by xojo2018r2-2018.02-2.x86_64
libpthread.so.0(GLIBC_2.4) is needed by xojo2018r2-2018.02-2.x86_64
librt.so.1 is needed by xojo2018r2-2018.02-2.x86_64
librt.so.1(GLIBC_2.2) is needed by xojo2018r2-2018.02-2.x86_64
librt.so.1(GLIBC_2.4) is needed by xojo2018r2-2018.02-2.x86_64
libunwind-arm.so.8 is needed by xojo2018r2-2018.02-2.x86_64
libunwind.so.8 is needed by xojo2018r2-2018.02-2.x86_64
libutil.so.1 is needed by xojo2018r2-2018.02-2.x86_64
libutil.so.1(GLIBC_2.0) is needed by xojo2018r2-2018.02-2.x86_64
libutil.so.1(GLIBC_2.4) is needed by xojo2018r2-2018.02-2.x86_64
libz.so.1 is needed by xojo2018r2-2018.02-2.x86_64
Using the tar.gz package installs and runs as expected with gtk3-devel installed.