diff --git a/sendmail.spec b/sendmail.spec
index cd053c7..2916f81 100644
--- a/sendmail.spec
+++ b/sendmail.spec
@@ -17,7 +17,7 @@
 Summary: A widely used Mail Transport Agent (MTA)
 Name: sendmail
 Version: 8.15.2
-Release: 21%{?dist}
+Release: 22%{?dist}
 License: Sendmail
 Group: System Environment/Daemons
 URL: http://www.sendmail.org/
@@ -94,6 +94,7 @@ Patch29: sendmail-8.15.2-format-security.patch
 Patch30: sendmail-8.15.2-openssl-1.1.0-ecdhe-fix.patch
 Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildRequires: libdb-devel
+BuildRequires: libnsl2-devel
 BuildRequires: hesiod-devel
 BuildRequires: groff
 BuildRequires: ghostscript
@@ -232,8 +233,8 @@ sed -i 's|/usr/local/bin/perl|%{_bindir}/perl|' contrib/*.pl
 cat > redhat.config.m4 << EOF
 define(\`confMAPDEF', \`-DNEWDB -DNIS -DHESIOD -DMAP_REGEX -DSOCKETMAP -DNAMED_BIND=1')
 define(\`confOPTIMIZE', \`\`\`\`${RPM_OPT_FLAGS}'''')
-define(\`confENVDEF', \`-I%{_includedir}/libdb -I/usr/kerberos/include -Wall -DXDEBUG=0 -DNETINET6 -DHES_GETMAILHOST -DUSE_VENDOR_CF_PATH=1 -D_FFR_TLS_1 -D_FFR_LINUX_MHNL -D_FFR_QOS -D_FFR_TLS_EC -D_FILE_OFFSET_BITS=64 -DHESIOD_ALLOW_NUMERIC_LOGIN')
-define(\`confLIBDIRS', \`-L/usr/kerberos/%{_lib}')
+define(\`confENVDEF', \`-I%{_includedir}/libdb -I/usr/kerberos/include -I%{_includedir}/nsl -Wall -DXDEBUG=0 -DNETINET6 -DHES_GETMAILHOST -DUSE_VENDOR_CF_PATH=1 -D_FFR_TLS_1 -D_FFR_LINUX_MHNL -D_FFR_QOS -D_FFR_TLS_EC -D_FILE_OFFSET_BITS=64 -DHESIOD_ALLOW_NUMERIC_LOGIN')
+define(\`confLIBDIRS', \`-L/usr/kerberos/%{_lib} -L%{_libdir}/nsl')
 define(\`confLIBS', \`-lnsl -lhesiod -lcrypt -ldb -lresolv')
 %{?_hardened_build:define(\`confLDOPTS', \`-Xlinker -z -Xlinker relro -Xlinker -z -Xlinker now')}
 define(\`confMANOWN', \`root')
@@ -737,6 +738,9 @@ fi
 %endif
 
 %changelog
+* Sun Jan 21 2018 Björn Esser <besser82@fedoraproject.org> - 8.15.2-22
+- Explicitly BR: libnsl2-devel and add needed paths in build config
+
 * Sat Jan 20 2018 Björn Esser <besser82@fedoraproject.org> - 8.15.2-21
 - Rebuilt for switch to libxcrypt