Failed compile on Solaris 2.5.1

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Jacob Simpson
Your email address : jacobs(at)newbridge(dot)com

System Configuration
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Architecture (example: Intel Pentium) : Sparc Ultra 5

Operating System (example: Linux 2.0.26 ELF) : Solaris 2.5.1

PostgreSQL version (example: PostgreSQL-6.5.3): PostgreSQL-6.5.3

Compiler used (example: gcc 2.8.0) : gcc 2.8.1

Please enter a FULL description of your problem:
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During gmake all the make stops with this error message:

as -o tas.o tas.s
tas.s: Assembler messages:
tas.s:10: Error: Unknown pseudo-op: `.section'

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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I run
./configure --prefix=/home/bin/pgsql --without-CXX

then

gmake all

and the make fails.

If you know how this problem might be fixed, list the solution below:
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No idea I'm afraid.