Port Bug Report: cannot find dlfcn.h

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Alberto Marconi
Your email address : amarconi(at)akros(dot)it

Category : install: compile
Severity : serious

Summary: cannot find dlfcn.h

System Configuration
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Operating System : Linux 2.0.0 ELF

PostgreSQL version : 6.4.2

Compiler used : gcc 2.7.2

Hardware:
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Slackware
Linux dns 2.0.0 #3 Fri Jul 10 15:30:24 MET DST 1998 i486
i486 66Mhz (test system) 32 MB RAM

Versions of other tools:
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gmake 3.74
flex 2.5.4a

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Problem Description:
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When I compile, I get the error shown below:

gcc -I../../include -I../../backend -O2 -Wall -Wmissing-prototypes -I.. -c
In file included from dynloader.c:24:
../../include/dynloader.h:19: dlfcn.h: No such file or directory
make[2]: *** [dynloader.o] Error 1
make[2]: Leaving directory `/usr/src/pgsql/postgresql-6.4.2/src/backend/port'
make[1]: *** [port.dir] Error 2
make[1]: Leaving directory `/usr/src/pgsql/postgresql-6.4.2/src/backend'
make: *** [all] Error 2

I found some references to this problem in your mailing lists,
but I could not find a solution nor a workaround.
Please help.

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Test Case:
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Solution:
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