env LD_DEBUG=all LD_DEBUG_OUTPUT=/home/postgres/dbg.out pg_ctl start

rh8 good:
     19097:	symbol=fft_factor;  lookup in file=postgres: postgres regression [local] SELECT
     19097:	symbol=fft_factor;  lookup in file=/usr/lib/libz.so.1
     19097:	symbol=fft_factor;  lookup in file=/usr/lib/libreadline.so.4
     19097:	symbol=fft_factor;  lookup in file=/lib/libtermcap.so.2
     19097:	symbol=fft_factor;  lookup in file=/lib/libcrypt.so.1
     19097:	symbol=fft_factor;  lookup in file=/lib/libresolv.so.2
     19097:	symbol=fft_factor;  lookup in file=/lib/libnsl.so.1
     19097:	symbol=fft_factor;  lookup in file=/lib/libdl.so.2
     19097:	symbol=fft_factor;  lookup in file=/lib/i686/libm.so.6
     19097:	symbol=fft_factor;  lookup in file=/lib/i686/libc.so.6
     19097:	symbol=fft_factor;  lookup in file=/lib/ld-linux.so.2
     19097:	symbol=fft_factor;  lookup in file=/usr/local/pgsql/lib/plr.so
     19097:	symbol=fft_factor;  lookup in file=/usr/local/lib/R/bin/libR.so
     19097:	binding file /usr/local/lib/R/bin/libR.so to /usr/local/lib/R/bin/libR.so: normal symbol `fft_factor'
     19097:	symbol=re_compile_fastmap;  lookup in file=postgres: postgres regression [local] SELECT
     19097:	symbol=re_compile_fastmap;  lookup in file=/usr/lib/libz.so.1
     19097:	symbol=re_compile_fastmap;  lookup in file=/usr/lib/libreadline.so.4
     19097:	symbol=re_compile_fastmap;  lookup in file=/lib/libtermcap.so.2
     19097:	symbol=re_compile_fastmap;  lookup in file=/lib/libcrypt.so.1
     19097:	symbol=re_compile_fastmap;  lookup in file=/lib/libresolv.so.2
     19097:	symbol=re_compile_fastmap;  lookup in file=/lib/libnsl.so.1
     19097:	symbol=re_compile_fastmap;  lookup in file=/lib/libdl.so.2
     19097:	symbol=re_compile_fastmap;  lookup in file=/lib/i686/libm.so.6
     19097:	symbol=re_compile_fastmap;  lookup in file=/lib/i686/libc.so.6
     19097:	symbol=re_compile_fastmap;  lookup in file=/lib/ld-linux.so.2
     19097:	symbol=re_compile_fastmap;  lookup in file=/usr/local/pgsql/lib/plr.so
     19097:	symbol=re_compile_fastmap;  lookup in file=/usr/local/lib/R/bin/libR.so
     19097:	binding file /usr/local/lib/R/bin/libR.so to /usr/local/lib/R/bin/libR.so: normal symbol `re_compile_fastmap'

     nm /lib/i686/libc.so.6
     000b7dc0 W re_compile_fastmap

rh9 bad:
      2074:	symbol=fft_factor;  lookup in file=postgres: postgres regression [local] SELECT
      2074:	symbol=fft_factor;  lookup in file=/usr/lib/libz.so.1
      2074:	symbol=fft_factor;  lookup in file=/usr/lib/libreadline.so.4
      2074:	symbol=fft_factor;  lookup in file=/lib/libtermcap.so.2
      2074:	symbol=fft_factor;  lookup in file=/lib/libcrypt.so.1
      2074:	symbol=fft_factor;  lookup in file=/lib/libresolv.so.2
      2074:	symbol=fft_factor;  lookup in file=/lib/libnsl.so.1
      2074:	symbol=fft_factor;  lookup in file=/lib/libdl.so.2
      2074:	symbol=fft_factor;  lookup in file=/lib/tls/libm.so.6
      2074:	symbol=fft_factor;  lookup in file=/lib/tls/libc.so.6
      2074:	symbol=fft_factor;  lookup in file=/lib/ld-linux.so.2
      2074:	symbol=fft_factor;  lookup in file=/usr/lib/postgresql/plr.so
      2074:	symbol=fft_factor;  lookup in file=/usr/local/lib/R/bin/libR.so
      2074:	binding file /usr/local/lib/R/bin/libR.so to /usr/local/lib/R/bin/libR.so: normal symbol `fft_factor'
      2074:	symbol=re_compile_fastmap;  lookup in file=postgres: postgres regression [local] SELECT
      2074:	symbol=re_compile_fastmap;  lookup in file=/usr/lib/libz.so.1
      2074:	symbol=re_compile_fastmap;  lookup in file=/usr/lib/libreadline.so.4
      2074:	symbol=re_compile_fastmap;  lookup in file=/lib/libtermcap.so.2
      2074:	symbol=re_compile_fastmap;  lookup in file=/lib/libcrypt.so.1
      2074:	symbol=re_compile_fastmap;  lookup in file=/lib/libresolv.so.2
      2074:	symbol=re_compile_fastmap;  lookup in file=/lib/libnsl.so.1
      2074:	symbol=re_compile_fastmap;  lookup in file=/lib/libdl.so.2
      2074:	symbol=re_compile_fastmap;  lookup in file=/lib/tls/libm.so.6
      2074:	symbol=re_compile_fastmap;  lookup in file=/lib/tls/libc.so.6
      2074:	binding file /usr/local/lib/R/bin/libR.so to /lib/tls/libc.so.6: normal symbol `re_compile_fastmap'

      nm /lib/tls/libc.so.6
      420b6450 W re_compile_fastmap