diff --git a/git.changes b/git.changes
index fcd4de6..2b369b2 100644
--- a/git.changes
+++ b/git.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Nov  6 15:47:22 CET 2017 - tiwai@suse.de
+
+- Build with the external libsha1detectcoll (bsc#1042644)
+
 -------------------------------------------------------------------
 Wed Nov  1 13:10:43 UTC 2017 - astieger@suse.com
 
diff --git a/git.spec b/git.spec
index cd1a42a..ab6b602 100644
--- a/git.spec
+++ b/git.spec
@@ -67,6 +67,9 @@ BuildRequires:  libexpat-devel
 BuildRequires:  libgnome-keyring-devel
 %endif
 BuildRequires:  libopenssl-devel
+%if 0%{?suse_version} > 1320
+BuildRequires:  libsha1detectcoll-devel
+%endif
 BuildRequires:  pcre2-devel
 BuildRequires:  perl-Error
 BuildRequires:  python
@@ -259,6 +262,9 @@ make %{_smp_mflags} CFLAGS="$RPM_OPT_FLAGS" \
        DESTDIR=$RPM_BUILD_ROOT \
        NO_CROSS_DIRECTORY_HARDLINKS=1 \
        NO_INSTALL_HARDLINKS=1 \
+%if 0%{?suse_version} > 1320
+       DC_SHA1_EXTERNAL=YesPlease \
+%endif
        USE_LIBPCRE2=YesPlease \
        V=1 \
        prefix=%{_prefix} mandir=%{_mandir} \