Missing Debian dev package in installation doc

libsasl2-dev package is missing from the Debian prereq list in README.rst. Error message seen while running "make apps" if this package is missing is:

building '_ldap' extension
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DHAVE_LIBLDAP_R -DHAVE_SASL -DHAVE_TLS -DLDAPMODULE_VERSION=2.3.11 -IModules -I/opt/openldap-RE24/include -I/usr/include/sasl -I/usr/include/python2.6 -c Modules/LDAPObject.c -o build/temp.linux-i686-2.6/Modules/LDAPObject.o
Modules/LDAPObject.c:18:18: error: sasl.h: No such file or directory
Modules/LDAPObject.c:553: error: expected declaration specifiers or '...' before 'sasl_interact_t'
Modules/LDAPObject.c: In function 'interaction':
Modules/LDAPObject.c:562: error: 'interact' undeclared (first use in this function)
Modules/LDAPObject.c:562: error: (Each undeclared identifier is reported only once
Modules/LDAPObject.c:562: error: for each function it appears in.)
Modules/LDAPObject.c: In function 'py_ldap_sasl_interaction':
Modules/LDAPObject.c:607: error: 'sasl_interact_t' undeclared (first use in this function)
Modules/LDAPObject.c:607: error: 'interact' undeclared (first use in this function)
Modules/LDAPObject.c:607: error: expected expression before ')' token
Modules/LDAPObject.c:610: error: 'SASL_CB_LIST_END' undeclared (first use in this function)
Modules/LDAPObject.c:612: error: too many arguments to function 'interaction'
error: command 'gcc' failed with exit status 1