Timo Sirainen wrote the following on 12.10.2012 14:50:
On 12.10.2012, at 10.45, Tamsy wrote:

Axel, please let us know whether one of these works: "SQL_LIBS=-lmysqlclient or 
AUTH_LIBS=-lmysqlclient or MYSQL_LIBS=-lmysqlclient".

Since Dovecot 1.x all the way up to 2.1.10 I had trouble with this and only by 
putting -lmysqlclient in LDFLAGS as described before Dovecot compiles without error 
(Ubuntu Server 8.04 & 10.04, mySQL in a non-standart location).
If you run configure without adding the -lmysqlclient, what do you get with:

egrep -i 'mysql|auth_libs|sql_libs' Makefile

I guess the problem is that I shouldn't have copy&pasted the mysql detection 
code from php, and configure somehow passes successfully without actually setting 
any MYSQL_LIBS..

Just ran configure without adding the -lmysqlclient (CPPFLAGS='-I/opt/mysql/include/mysql' LDFLAGS='-L/opt/mysql/lib/mysql -lz -lcrypt -lnsl -lm' ./configure --with-mysql....

egrep -i 'mysql|auth_libs|sql_libs' Makefile

says:

AUTH_LIBS =
CPPFLAGS = -I/opt/mysql/include/mysql
LDFLAGS = $(NOPLUGIN_LDFLAGS) -L/opt/mysql/lib/mysql -lz -lcrypt -lnsl -lm
MYSQL_CFLAGS =
MYSQL_CONFIG = NO
MYSQL_LIBS =
PGSQL_LIBS =
SQL_LIBS =
sql_drivers =  mysql
scan-build -o scan-reports ../configure --with-ldap=auto --with-pgsql=auto --with-mysql=auto --with-sqlite=auto --with-solr=auto --with-gssapi=auto --with-libwrap=auto; \

configure runs without error but make ends with:
<snip>
../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_result_get_error': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:469: undefined reference to `mysql_errno' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:470: undefined reference to `mysql_error' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_result_get_field_value_binary': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:436: undefined reference to `mysql_fetch_lengths' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_result_fetch_fields': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:383: undefined reference to `mysql_num_fields' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:384: undefined reference to `mysql_fetch_fields' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_result_next_row': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:366: undefined reference to `mysql_fetch_row' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:370: undefined reference to `mysql_errno' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_result_free': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:351: undefined reference to `mysql_free_result' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_do_query': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:233: undefined reference to `mysql_query' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:237: undefined reference to `mysql_errno' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_query_s': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:315: undefined reference to `mysql_affected_rows' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:316: undefined reference to `mysql_store_result' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:321: undefined reference to `mysql_next_result' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:332: undefined reference to `mysql_free_result' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:327: undefined reference to `mysql_errno' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_exec': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:284: undefined reference to `mysql_error' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_escape_string': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:274: undefined reference to `mysql_real_escape_string' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:268: undefined reference to `mysql_escape_string' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_connect': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:83: undefined reference to `mysql_options' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:87: undefined reference to `mysql_options' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:92: undefined reference to `mysql_ssl_set' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:110: undefined reference to `mysql_real_connect' /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:123: undefined reference to `mysql_error' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_deinit_v': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:226: undefined reference to `mysql_close' ../../src/lib-sql/.libs/libsql.a(driver-mysql.o): In function `driver_mysql_parse_connect_string': /usr/local/src/dovecot-2.1.10/src/lib-sql/driver-mysql.c:198: undefined reference to `mysql_init'
collect2: ld returned 1 exit status
make[3]: *** [auth] Error 1
make[3]: Leaving directory `/usr/local/src/dovecot-2.1.10/src/auth'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/usr/local/src/dovecot-2.1.10/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/local/src/dovecot-2.1.10'
make: *** [all] Error 2

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