diff --git a/configure.ac b/configure.ac
index d1cfe2fbf2..b5c2474344 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 9037787808..185bb298d7 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 4720dfe8b7..dfc10cd5d0 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 1c7eee3323..d1d55ad297 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 6e42c4fa08..e0f1adbb9f 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 1a07bcbb30..2b43b19b0d 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 f6106450b8..456fe28af2 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