Why are the binaries built by msys2 always much smaller than the ones I build?

[Fourish]

For example, the libwinpthread package, I built using ./configure --prefix=/f/main/repo/mingw-w64/output --enable-shared --enable-static. In ldd, it shows that it links to

$ ldd ./libwinpthread-1.dll
        ntdll.dll => /c/WINDOWS/SYSTEM32/ntdll.dll (0x7fff153e0000)
        KERNEL32.DLL => /c/WINDOWS/System32/KERNEL32.DLL (0x7fff136e0000)
        KERNELBASE.dll => /c/WINDOWS/System32/KERNELBASE.dll (0x7fff12c20000)
        msvcrt.dll => /c/WINDOWS/System32/msvcrt.dll (0x7fff13180000)
        ucrtbase.dll => /c/WINDOWS/System32/ucrtbase.dll (0x7fff12970000)

Packages built with msys2 are linked to

$ ldd "F:\build_essential\msys64\ucrt64\bin\libwinpthread-1.dll"
        ntdll.dll => /c/WINDOWS/SYSTEM32/ntdll.dll (0x7fff153e0000)
        KERNEL32.DLL => /c/WINDOWS/System32/KERNEL32.DLL (0x7fff136e0000)
        KERNELBASE.dll => /c/WINDOWS/System32/KERNELBASE.dll (0x7fff12c20000)
        msvcrt.dll => /c/WINDOWS/System32/msvcrt.dll (0x7fff13180000)
        ucrtbase.dll => /c/WINDOWS/System32/ucrtbase.dll (0x7fff12970000)
        advapi32.dll => /c/WINDOWS/System32/advapi32.dll (0x7fff14f40000)
        sechost.dll => /c/WINDOWS/System32/sechost.dll (0x7fff14bc0000)
        RPCRT4.dll => /c/WINDOWS/System32/RPCRT4.dll (0x7fff13490000)
        CRYPTBASE.DLL => /c/WINDOWS/SYSTEM32/CRYPTBASE.DLL (0x7fff11a40000)
        bcryptPrimitives.dll => /c/WINDOWS/System32/bcryptPrimitives.dll (0x7fff12ac0000)

How can I make my libwinpthread build dynamically link to the remaining libraries? ; (

[Fourish]

After using strip --strip-unneeded --strip-debug, these binaries are much smaller.