diff --git a/make/defs.mk b/make/defs.mk
index 16045482..2d04bee9 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -897,12 +897,24 @@ EXE_SEARCH_PATH           += $(XCHANGE_NEXUS_DIR)/bin
 PREREQ                    += XCHANGE_NEXUS
 endif
 
+ifneq ($(filter feedfs-mixer,$(PREREQ_BUILD)),)
+FEEDFS_MIXER_DIR           = $(firstword $(wildcard $(CVS_PROJ_DIR)/feedfs-mixer /opt/$(FLAVOUR_PATH_PREFIX)feedfs-mixer))
+FEEDFS_MIXER_VERSION       = $(call version,$(FEEDFS_MIXER_DIR))
+RPM_REQUIRES_RUN          += $(FLAVOUR_PREFIX)feedfs-mixer-run = $(FEEDFS_MIXER_VERSION)
+RPM_REQUIRES_DEVEL        += $(FLAVOUR_PREFIX)feedfs-mixer-devel = $(FEEDFS_MIXER_VERSION)
+PREREQ_BUILD              += feedfs-dsp
+INCLUDE                   += -I$(FEEDFS_MIXER_DIR)/include
+LIBFLAGS                  += -L$(FEEDFS_MIXER_DIR)/lib -lfeedfs-mixer
+EXE_SEARCH_PATH           += $(FEEDFS_MIXER_DIR)/bin
+PREREQ                    += FEEDFS_MIXER
+endif
+
 ifneq ($(filter feedfs-dsp,$(PREREQ_BUILD)),)
 FEEDFS_DSP_DIR            = $(firstword $(wildcard $(CVS_PROJ_DIR)/feedfs-dsp /opt/$(FLAVOUR_PATH_PREFIX)feedfs-dsp))
 FEEDFS_DSP_VERSION        = $(call version,$(FEEDFS_DSP_DIR))
 RPM_REQUIRES_RUN          += $(FLAVOUR_PREFIX)feedfs-dsp-run = $(FEEDFS_DSP_VERSION)
 RPM_REQUIRES_DEVEL        += $(FLAVOUR_PREFIX)feedfs-dsp-devel = $(FEEDFS_DSP_VERSION)
-PREREQ_BUILD              += feedfs-objects feedfs-circuit
+PREREQ_BUILD              += feedfs-objects feedfs-circuit dsptools
 INCLUDE                   += -I$(FEEDFS_DSP_DIR)/include
 LIBFLAGS                  += -L$(FEEDFS_DSP_DIR)/lib -lfeedfs-dsp
 EXE_SEARCH_PATH           += $(FEEDFS_DSP_DIR)/bin