diff --git a/Makefile b/Makefile
index f081dfae5832bacd1509c3e1664ac18c3c627383..a5fbc105a9ea5a8455fc4601dda3f920bd5a352e 100644
--- a/Makefile
+++ b/Makefile
@@ -338,12 +338,11 @@ PC_TEMPLATE = prefix=$(prefix)\nexec_prefix=\$${prefix}\nincludedir=\$${prefix}/
 # gpr .pc file
 PC_NAME = Google Public Runtime
 PC_DESCRIPTION = Google Public Runtime
-PC_CFLAGS =
+PC_CFLAGS = -pthread
 PC_REQUIRES_PRIVATE =
+PC_LIBS_PRIVATE = -lpthread
 ifeq ($(SYSTEM),Darwin)
-PC_LIBS_PRIVATE = -lrt
-else
-PC_LIBS_PRIVATE =
+PC_LIBS_PRIVATE += -lrt
 endif
 GPR_PC_FILE := $(PC_TEMPLATE)
 
diff --git a/templates/Makefile.template b/templates/Makefile.template
index 6b4b3e12a7116094b006b849894f6fc285f41825..2a2f6960cf2518cfd8b91f39e3b042cf520379e1 100644
--- a/templates/Makefile.template
+++ b/templates/Makefile.template
@@ -363,12 +363,11 @@ Libs.private: $(PC_LIBS_PRIVATE)
 # gpr .pc file
 PC_NAME = Google Public Runtime
 PC_DESCRIPTION = Google Public Runtime
-PC_CFLAGS =
+PC_CFLAGS = -pthread
 PC_REQUIRES_PRIVATE =
+PC_LIBS_PRIVATE = -lpthread
 ifeq ($(SYSTEM),Darwin)
-PC_LIBS_PRIVATE = -lrt
-else
-PC_LIBS_PRIVATE =
+PC_LIBS_PRIVATE += -lrt
 endif
 GPR_PC_FILE := $(PC_TEMPLATE)