I see the following test failures during "make check". I'm building this on the Openismus Jenkins server, with the latest git master code for glib and glib-networking.

Making check in tests
make[1]: Entering directory `/var/lib/jenkins/workspace/libsoup/tests'
make  check-am

make[2]: Entering directory `/var/lib/jenkins/workspace/libsoup/tests'
make  check-TESTS check-local
make[3]: Entering directory `/var/lib/jenkins/workspace/libsoup/tests'

cache-test: OK
PASS: cache-test
chunk-test: OK
PASS: chunk-test

coding-test: OK
PASS: coding-test

apache2: Syntax error on line 25 of /var/lib/jenkins/workspace/libsoup/tests/httpd.conf: Cannot load / into server: /: cannot read file data: Is a directory
Could not start apache
FAIL: connection-test

context-test: OK
PASS: context-test
continue-test: OK
PASS: continue-test

cookies-test: OK
PASS: cookies-test
date: OK
PASS: date
header-parsing: OK
PASS: header-parsing

misc-test: OK
PASS: misc-test

multipart-test: OK
PASS: multipart-test

ntlm-test: OK
PASS: ntlm-test

redirect-test: OK
PASS: redirect-test

requester-test: OK
PASS: requester-test
resource-test: OK
PASS: resource-test

session-test: OK
PASS: session-test

sniffing-test: OK
PASS: sniffing-test
socket-test: OK
PASS: socket-test

ssl-test: OK
PASS: ssl-test

streaming-test: OK
PASS: streaming-test

timeout-test: OK
PASS: timeout-test
tld-test: OK
PASS: tld-test

uri-parsing: OK
PASS: uri-parsing
apache2: Syntax error on line 25 of /var/lib/jenkins/workspace/libsoup/tests/httpd.conf: Cannot load / into server: /: cannot read file data: Is a directory
Could not start apache
FAIL: auth-test
apache2: Syntax error on line 25 of /var/lib/jenkins/workspace/libsoup/tests/httpd.conf: Cannot load / into server: /: cannot read file data: Is a directory
Could not start apache
FAIL: proxy-test
apache2: Syntax error on line 25 of /var/lib/jenkins/workspace/libsoup/tests/httpd.conf: Cannot load / into server: /: cannot read file data: Is a directory
Could not start apache
FAIL: pull-api

apache2: Syntax error on line 25 of /var/lib/jenkins/workspace/libsoup/tests/httpd.conf: Cannot load / into server: /: cannot read file data: Is a directory
Could not start apache
FAIL: range-test

forms-test: OK
PASS: forms-test

server-auth-test: OK
PASS: server-auth-test
========================================================================
5 of 29 tests failed
Please report to http://bugzilla.gnome.org/enter_bug.cgi?product=libsoup


You should be able to see some more of the build details here:
http://jenkins.openismus.com/job/libsoup/41/console