Port Bug Report: libpq++ will not build because of pgenv

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name        : Darin Fisher
Your email address    : oz@pfm.net

Category        : install: compile
Severity        : serious

Summary: libpq++ will not build because of pgenv

System Configuration
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  Operating System   : Linux 2.1.130 ELF

  PostgreSQL version : 6.4

  Compiler used      : gcc 2.8.1

Hardware:
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Linux oz 2.1.130 #5 SMP Sat Nov 28 15:45:23 MST 1998 i586 unknown
Pentium 75 w/ 128MBRAM



Versions of other tools:
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flex 2.5.4
gmake 3.75
GNU ld 2.7.1

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Problem Description:
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libpq++ will not build because pgenv.h complains that
"string" is not found from line 21:
#include <string>
This builds under Solaris 2.5.1
6.3.2 builds on the same Linux system

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Test Case:
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I just ran through the standard build procedure.
oz# pwd
/usr/local/src/postgres/postgresql-v6.4/src/interfaces/libpq++
oz# make
c++  -I../../backend -I../../include -I../../interfaces/libpq -I../../include -I../../backend   -O2  -Wall
-Wmissing-prototypes-fpic   -c pgenv.cc -o pgenv.o 
In file included from pgenv.cc:23:
pgenv.h:21: string: No such file or directory
make: *** [pgenv.o] Error 1


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Solution:
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