Description of problem:
default glibc installation .SPEC has little downward kernel compatibility.
Even static link is not portable.

glibc.spec
Conflicts: kernel < 2.6.9
%define enablekernel 2.6.9

Version-Release number of selected component (if applicable):
source compile platform RHEL 5.2
target compile running platform RHEL 3

How reproducible:
# vi hello.cpp

#include <iostream>

int main()
{
  std::cout << "Hello World!" << std::endl;
  return 0;
}

# g++ hello.cpp -m32 -static -o hello
  
# file hello
hello: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.9, statically linked, for GNU/Linux 2.6.9, not stripped

# ./hello
Hello World!

Actual results:
On the target RHEL 3 platform using same static binary.
# ./hello
FATAL: kernel too old
Segmentation fault

Recompile glibc in RHEL 5.2 to have enablekernel 2.4.0 and Conflicts < 2.4.0 and recompile static also cannot run the program in lower version of RHEL.

Expected results:
static binary portability.

Additional info: