diff --git a/configure.ac b/configure.ac
index d1cfe2fbf2610762e74ee26c98e58c9d42ae145e..b5c24743449f1cbd8ac3aedb4af6df04b66c052c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -76,6 +76,12 @@ if test "$sys_name" = "cygwin"; then
     AC_DEFINE(CANNOT_DELETE_OPEN_FILES, 1, [Whether it is impossible to delete open files.])
 fi
 
+# Solaris-specific stuff.
+if test "$sys_name" = "sunos"; then
+    # Solaris requires -lsocket -lnsl for network functions
+    ADDITIONAL_NETWORK_LIBS="-lsocket -lnsl"
+    AC_SUBST(ADDITIONAL_NETWORK_LIBS)
+fi
 
 AC_PROG_CC
 AC_PROG_CXX
diff --git a/src/libstore/Makefile.am b/src/libstore/Makefile.am
index 90377878087ff29b7a84b4e229681e07b182ac2e..185bb298d701dca3f41839d16799222d729da1c7 100644
--- a/src/libstore/Makefile.am
+++ b/src/libstore/Makefile.am
@@ -10,7 +10,7 @@ pkginclude_HEADERS = \
   globals.hh db.hh references.hh pathlocks.hh \
   worker-protocol.hh
 
-libstore_la_LIBADD = ../libutil/libutil.la ../boost/format/libformat.la
+libstore_la_LIBADD = ../libutil/libutil.la ../boost/format/libformat.la @ADDITIONAL_NETWORK_LIBS@
 
 BUILT_SOURCES = derivations-ast.cc derivations-ast.hh
 
diff --git a/src/nix-env/Makefile.am b/src/nix-env/Makefile.am
index 4720dfe8b780131ab54fbc6c7f677683919d8911..dfc10cd5d039bcc88510113f156e04a827dc2ac1 100644
--- a/src/nix-env/Makefile.am
+++ b/src/nix-env/Makefile.am
@@ -3,7 +3,7 @@ bin_PROGRAMS = nix-env
 nix_env_SOURCES = nix-env.cc profiles.cc profiles.hh help.txt
 nix_env_LDADD = ../libmain/libmain.la ../libexpr/libexpr.la \
  ../libstore/libstore.la ../libutil/libutil.la \
- ../boost/format/libformat.la ${bdb_lib} ${aterm_lib}
+ ../boost/format/libformat.la ${bdb_lib} ${aterm_lib} @ADDITIONAL_NETWORK_LIBS@
 
 nix-env.o: help.txt.hh
 
diff --git a/src/nix-hash/Makefile.am b/src/nix-hash/Makefile.am
index 1c7eee332329f65071ff64a90834a7eb3fe3f803..d1d55ad297f52fd93712ef6ff7ce994de352ee6e 100644
--- a/src/nix-hash/Makefile.am
+++ b/src/nix-hash/Makefile.am
@@ -2,7 +2,7 @@ bin_PROGRAMS = nix-hash
 
 nix_hash_SOURCES = nix-hash.cc help.txt
 nix_hash_LDADD = ../libmain/libmain.la ../libstore/libstore.la ../libutil/libutil.la \
- ../boost/format/libformat.la ${bdb_lib} ${aterm_lib}
+ ../boost/format/libformat.la ${bdb_lib} ${aterm_lib} @ADDITIONAL_NETWORK_LIBS@
 
 nix-hash.o: help.txt.hh
 
diff --git a/src/nix-instantiate/Makefile.am b/src/nix-instantiate/Makefile.am
index 6e42c4fa08c44d834507167c01ff9f8909731ef5..e0f1adbb9f41def582003972cbd5982b8a17536d 100644
--- a/src/nix-instantiate/Makefile.am
+++ b/src/nix-instantiate/Makefile.am
@@ -3,7 +3,7 @@ bin_PROGRAMS = nix-instantiate
 nix_instantiate_SOURCES = nix-instantiate.cc help.txt
 nix_instantiate_LDADD = ../libmain/libmain.la ../libexpr/libexpr.la \
  ../libstore/libstore.la ../libutil/libutil.la \
- ../boost/format/libformat.la ${bdb_lib} ${aterm_lib}
+ ../boost/format/libformat.la ${bdb_lib} ${aterm_lib} @ADDITIONAL_NETWORK_LIBS@
 
 nix-instantiate.o: help.txt.hh
 
diff --git a/src/nix-store/Makefile.am b/src/nix-store/Makefile.am
index 1a07bcbb300e2899990bca00a40e88a5b074ccae..2b43b19b0d60757180f73adc6974ad8bf10f5218 100644
--- a/src/nix-store/Makefile.am
+++ b/src/nix-store/Makefile.am
@@ -2,7 +2,7 @@ bin_PROGRAMS = nix-store
 
 nix_store_SOURCES = nix-store.cc dotgraph.cc dotgraph.hh help.txt
 nix_store_LDADD = ../libmain/libmain.la ../libstore/libstore.la ../libutil/libutil.la \
- ../boost/format/libformat.la ${bdb_lib} ${aterm_lib}
+ ../boost/format/libformat.la ${bdb_lib} ${aterm_lib} @ADDITIONAL_NETWORK_LIBS@
 
 nix-store.o: help.txt.hh
 
diff --git a/src/nix-worker/Makefile.am b/src/nix-worker/Makefile.am
index f6106450b8588e2a338c99b2af32212e6d42ba7b..456fe28af2d5f89ff30a893aa647a0d84e206097 100644
--- a/src/nix-worker/Makefile.am
+++ b/src/nix-worker/Makefile.am
@@ -2,7 +2,7 @@ bin_PROGRAMS = nix-worker
 
 nix_worker_SOURCES = nix-worker.cc help.txt
 nix_worker_LDADD = ../libmain/libmain.la ../libstore/libstore.la ../libutil/libutil.la \
- ../boost/format/libformat.la ${bdb_lib} ${aterm_lib}
+ ../boost/format/libformat.la ${bdb_lib} ${aterm_lib} @ADDITIONAL_NETWORK_LIBS@
 
 nix-worker.o: help.txt.hh