diff --git a/c-deps/builddeps.sh b/c-deps/builddeps.sh
index 6ed192ed4..3d63c6e4a 100755
--- a/c-deps/builddeps.sh
+++ b/c-deps/builddeps.sh
@@ -2,6 +2,8 @@
 
 set -e
 
+. ./vars
+
 BASE=$(pwd)
 LIBS="$BASE/libs"
 mkdir -p $LIBS
@@ -10,7 +12,7 @@ mkdir -p $LIBS
 if [ ! -f $LIBS/libjemalloc.a ]; then
 	cd jemalloc
 	bash autogen.sh
-	make -j8
+	${MAKE_CMD} -j${MAXJOBS}
 	cp lib/libjemalloc.a ../libs
 	cd ../libs
 fi
@@ -24,7 +26,7 @@ if [ ! -f $LIBS/libsnappy.a ]; then
 	cd build
 	cmake ../
 	# sed -i.bak  s/BUILD_SHARED_LIBS:BOOL=OFF/BUILD_SHARED_LIBS:BOOL=ON/g CMakeCache.txt
-	make -j8
+	${MAKE_CMD} -j${MAXJOBS}
 
 	cp libsnappy.a ../../libs/
 	cp snappy-stubs-public.h ../
@@ -40,9 +42,9 @@ if [ ! -f $LIBS/librocksdb.a ]; then
 	cd build
 	cmake -DWITH_GFLAGS=OFF -DPORTABLE=ON \
 	-DWITH_SNAPPY=ON -DSNAPPY_LIBRARIES="$LIBS/libsnappy.a" -DSNAPPY_INCLUDE_DIR="$BASE/snappy" \
-	-DWITH_JEMALLOC=ON -DJEMALLOC_LIBRARIES="$LIBS/libjemalloc.a" -DJEMALLOC_INCLUDE_DIR="$BASE/jemalloc/include" \
+	-DWITH_JEMALLOC=${JEMALLOC_ENABLE} -DJEMALLOC_LIBRARIES="$LIBS/libjemalloc.a" -DJEMALLOC_INCLUDE_DIR="$BASE/jemalloc/include" \
 	-DCMAKE_BUILD_TYPE=Release -DUSE_RTTI=1 ../
-	make -j8 rocksdb
+	${MAKE_CMD} -j${MAXJOBS} rocksdb
 
 	cp librocksdb.a ../../libs
 fi
diff --git a/c-deps/cleandeps.sh b/c-deps/cleandeps.sh
index ae8e538dc..e7f2ae30f 100755
--- a/c-deps/cleandeps.sh
+++ b/c-deps/cleandeps.sh
@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 
+. ./vars
+
 for i in jemalloc snappy rocksdb
 do
-    make -C $i clean
-done
\ No newline at end of file
+    ${MAKE_CMD} -C $i clean
+done
diff --git a/c-deps/vars b/c-deps/vars
new file mode 100644
index 000000000..69eab4ffc
--- /dev/null
+++ b/c-deps/vars
@@ -0,0 +1,15 @@
+#! /usr/bin/env bash
+# OS specific settings
+
+Osname=$(uname)
+if [ "${Osname}" == "DragonFly" ]; then
+        # DragonFly BSD
+        JEMALLOC_ENABLE="OFF"
+        MAKE_CMD=gmake
+        MAXJOBS=$(sysctl -n hw.ncpu)
+else
+        # Linux, Darwin
+        MAKE_CMD=make
+        JEMALLOC_ENABLE="ON"
+        MAXJOBS=8
+fi
diff --git a/rocksdb/flags.go b/rocksdb/flags.go
index 0862ff705..ac882ff37 100644
--- a/rocksdb/flags.go
+++ b/rocksdb/flags.go
@@ -20,12 +20,12 @@ package rocksdb
 // #cgo CXXFLAGS: -std=c++11 -O3 -I${SRCDIR}/../c-deps/rocksdb/include
 // #cgo LDFLAGS: -L${SRCDIR}/../c-deps/libs
 // #cgo LDFLAGS: -lrocksdb
-// #cgo LDFLAGS: -ljemalloc
+// #cgo !dragonfly LDFLAGS: -ljemalloc
 // #cgo LDFLAGS: -lsnappy
 // #cgo LDFLAGS: -lstdc++
 // #cgo LDFLAGS: -ldl
 // #cgo LDFLAGS: -lpthread
 // #cgo LDFLAGS: -lm
 // #cgo darwin LDFLAGS: -Wl,-undefined -Wl,dynamic_lookup
-// #cgo !darwin LDFLAGS: -Wl,-unresolved_symbols=ignore-all -lrt
+// #cgo linux LDFLAGS: -Wl,-unresolved_symbols=ignore-all -lrt
 import "C"