Why does devtoolset-3 eclipse crahes with Failed to load module "pk-gtk-module"?

Issue

• devtoolset-3 eclipse crashes when a project is opened

scl enable devtoolset-3 'eclipse'
CompilerOracle: exclude org/eclipse/core/internal/dtree/DataTreeNode.forwardDeltaWith
CompilerOracle: exclude org/eclipse/jdt/internal/compiler/lookup/ParameterizedMethodBinding.<init>
CompilerOracle: exclude org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPTemplates.instantiateTemplate
CompilerOracle: exclude org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPLinkage.addBinding
CompilerOracle: exclude org/python/pydev/editor/codecompletion/revisited/PythonPathHelper.isValidSourceFile
CompilerOracle: exclude org/eclipse/tycho/core/osgitools/EquinoxResolver.newState
Gtk-Message: Failed to load module "pk-gtk-module":

• When opening either of two projects the user has, Eclipse crashes, and emits everything below starting with /usr/bin/java: symbol lookup error:...

/usr/bin/java: symbol lookup error: /usr/lib64/gio/modules/libgiognutls.so: undefined symbol: g_tls_backend_get_type
/opt/rh/devtoolset-3/root/usr/lib64/eclipse/eclipse: symbol lookup error: /usr/lib64/gio/modules/libgiognutls.so: undefined symbol: g_tls_backend_get_type