Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
gtkmm3.0
gtkmm3.0(x86-32)
gtkmm30
gtkmm30(x86-32)
libgdkmm-3.0.so.1
libgtkmm-3.0.so.1

Requires :

atkmm(x86-32) >= 2.24.2
cairomm(x86-32) >= 1.12.0
gdk-pixbuf2(x86-32) >= 2.35.5
glibmm2.4(x86-32) >= 2.54.0
gtk3(x86-32) >= 3.24.0
libatkmm-1.6.so.1
libc.so.6
libc.so.6(GLIBC_2.0)
libc.so.6(GLIBC_2.1.3)
libc.so.6(GLIBC_2.3.4)
libc.so.6(GLIBC_2.4)
libcairomm-1.0.so.1
libgcc_s.so.1
libgcc_s.so.1(GCC_3.0)
libgcc_s.so.1(GCC_3.3.1)
libgdk-3.so.0
libgdk_pixbuf-2.0.so.0
libgdkmm-3.0.so.1
libgiomm-2.4.so.1
libglib-2.0.so.0
libglibmm-2.4.so.1
libgobject-2.0.so.0
libgtk-3.so.0
libm.so.6
libm.so.6(GLIBC_2.0)
libpangomm-1.4.so.1
libsigc-2.0.so.0
libstdc++.so.6
libstdc++.so.6(CXXABI_1.3)
libstdc++.so.6(CXXABI_1.3.8)
libstdc++.so.6(GLIBCXX_3.4)
libstdc++.so.6(GLIBCXX_3.4.15)
pangomm(x86-32) >= 2.38.2
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsZstd) <= 5.4.18-1
rtld(GNU_HASH)

Content of RPM :
/usr/lib/.build-id
/usr/lib/.build-id/40
/usr/lib/.build-id/40/33462593d3a2f67c5568aef91912e6fb6eaba4
/usr/lib/.build-id/4f
/usr/lib/.build-id/4f/3f9bb339a0e7d142ca6b479dc8a44dae1d9db3
/usr/lib/libgdkmm-3.0.so.1
/usr/lib/libgdkmm-3.0.so.1.1.0
/usr/lib/libgtkmm-3.0.so.1
/usr/lib/libgtkmm-3.0.so.1.1.0
/usr/share/doc/gtkmm3.0
/usr/share/doc/gtkmm3.0/NEWS
/usr/share/doc/gtkmm3.0/README.md
/usr/share/licenses/gtkmm3.0
/usr/share/licenses/gtkmm3.0/COPYING