The whole output after a second try looks like:

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Samba will be compiled with flags:
  CPP        = gcc -E
  CPPFLAGS   = -I./include -I. -I./lib -I./lib/replace -I./lib/talloc -D_SAMBA_BUILD_=4 -DHAVE_CONFIG_H
  CC         = gcc
  CFLAGS     =
  PICFLAG    = -fPIC
  BNLD       = gcc
  BNLD_FLAGS =  -Wl,--export-dynamic
  STLD       = /usr/bin/ar
  STLD_FLAGS = -rcs
  SHLD       = gcc
  SHLD_FLAGS = -shared -Wl,-Bsymbolic
  MDLD       = gcc
  MDLD_FLAGS = -shared -Wl,-Bsymbolic -Wl,--allow-shlib-undefined
  SHLIBEXT   = so
  srcdir     = .
  builddir   = .
  pwd        = /mnt/devel/git/samba4/source
Compiling auth/ntlmssp/ntlmssp_server.c
auth/ntlmssp/ntlmssp_server.c: In function âgensec_ntlmssp_session_infoâ:
auth/ntlmssp/ntlmssp_server.c:734: error: incompatible types in assignment
The following command failed:
gcc       -Iheimdal/../heimdal_build -Iheimdal/lib/gssapi -Iheimdal/lib/gssapi/gssapi -Iheimdal/lib/gssapi/spnego -Iheimdal/lib/gssapi/krb5 -Iheimdal/lib/gssapi/mech -Iheimdal_build -Iheimdal/lib/roken -Iheimdal/lib/gssapi   -Ilib/events   -Iheimdal/../heimdal_build -Iheimdal/lib/krb5 -Iheimdal/lib/asn1 -Iheimdal/lib/com_err -Iheimdal/../heimdal_build -Iheimdal/lib/hx509 -Iheimdal/lib/hx509 -Iheimdal/lib/asn1 -Iheimdal/lib/asn1 -Iheimdal/lib/asn1 -Iheimdal/lib/hx509 -Iheimdal/../heimdal_build -Iheimdal/lib/hcrypto -Iheimdal/lib -Iheimdal/../heimdal_build -Iheimdal/lib/hcrypto/imath -Iheimdal/../heimdal_build -Iheimdal/lib/krb5 -Iheimdal/lib/asn1 -Iheimdal/lib/com_err -Iheimdal/../heimdal_build -Iheimdal/lib/wind -Iheimdal/lib/asn1 -Iheimdal/lib/asn1 -Iheimdal/lib/asn1 -Iheimdal/lib/asn1 -Iheimdal/../heimdal_build -Iheimdal/lib/asn1 -Iheimdal/../heimdal_build -Iheimdal/lib/com_err -Iheimdal/../heimdal_build -Iheimdal/lib/roken -Ilib/socket_wrapper   -I/opt/kde4/include    -I/opt/kde4/include    -Ilib/replace         -I/opt/kde4/include    -fPIC -I./include -I. -I./lib -I./lib/replace -I./lib/talloc -D_SAMBA_BUILD_=4 -DHAVE_CONFIG_H  -c auth/ntlmssp/ntlmssp_server.c -o auth/ntlmssp/ntlmssp_server.o
make: *** [auth/ntlmssp/ntlmssp_server.o] Error 1

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GCC-Version is 4.3.2, Kernel-Version is 2.6.25.11.

I'm running SuSE 11.0 32bit on an Athlon 64 X2 6000+.

My last succesfull build was 4.0.0alpha4-GIT-9dbb061.