Packaging and local install issue

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Dear,

After sucesfult build the rpm I tried to install it. But I fail to install the devel package for this reason:

Error:
 Problem: conflicting requests
  - nothing provides libstdx-allocator-ldc.so.2()(64bit) needed by stdx-allocator-devel-2.77.2-1.fc28.x86_64

What i do:

1. build rhe rpm rpmbuild -ba stdx-allocator.spec
2. Install main package

sudo dnf install ../RPMS/x8664/stdx-allocator-2.77.2-1.fc28.x8664.rpm

1. Install devel package

   sudo dnf install ../RPMS/x8664/stdx-allocator-devel-2.77.2-1.fc28.x8664.rpm

It is strange as the main package own the requested file:

# rpm -ql stdx-allocator | grep libstdx-allocator-ldc.so.2
/usr/lib64/libstdx-allocator-ldc.so.2
/usr/lib64/libstdx-allocator-ldc.so.2.77.2

The spec file -> here

Thanks for your help