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I'm trying to work on postgresql locally with ubuntu 10.04. I get this error after I configure with ./configure --enable-cassert --enable-debug --prefix=$HOME/pgsql when I make && make install I get this error: make -C parser all make[3]: Entering directory `/home/james/school/db/pg-stuff/hw1/postgresql-8.4.2/src/backend/parser' ERROR: `flex' is missing on your system. It is needed to create the file `scan.c'. You can either get flex from a GNU mirror site or download an official distribution of PostgreSQL, which contains pre-packaged flex output. make[3]: *** [scan.c] Error 1 make[3]: Leaving directory `/home/james/school/db/pg-stuff/hw1/postgresql-8.4.2/src/backend/parser' make[2]: *** [parser-recursive] Error 2 make[2]: Leaving directory `/home/james/school/db/pg-stuff/hw1/postgresql-8.4.2/src/backend' make[1]: *** [all] Error 2 make[1]: Leaving directory `/home/james/school/db/pg-stuff/hw1/postgresql-8.4.2/src' make: *** [all] Error 2 I tried to apt-get install flex but I get the same error. How can I install flex so that this will work?

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