diff --git a/include_CLANG.mk b/include_CLANG.mk
index d4b111b..0594f80 100644
--- a/include_CLANG.mk
+++ b/include_CLANG.mk
@@ -2,8 +2,8 @@ CC  = clang
 LINKER = $(CC)
 
 OPENMP   = #-fopenmp
-CFLAGS   = -Ofast -std=c99 $(OPENMP)
-LFLAGS   = $(OPENMP)
+CFLAGS   = -Ofast -std=c99 -pthread $(OPENMP)
+LFLAGS   = -pthread $(OPENMP)
 DEFINES  = -D_GNU_SOURCE
 INCLUDES =
 LIBS     =
diff --git a/include_GCC.mk b/include_GCC.mk
index 1e89b90..57c7964 100644
--- a/include_GCC.mk
+++ b/include_GCC.mk
@@ -2,8 +2,8 @@ CC  = gcc
 LINKER = $(CC)
 
 OPENMP   = # -fopenmp
-CFLAGS   = -Ofast -std=c11 $(OPENMP)
-LFLAGS   = $(OPENMP)
+CFLAGS   = -Ofast -std=c11 -pthread $(OPENMP)
+LFLAGS   = -pthread $(OPENMP)
 DEFINES  = -D_GNU_SOURCE
 INCLUDES =
 LIBS     =
diff --git a/include_ICC.mk b/include_ICC.mk
index 09613ac..d6ec166 100644
--- a/include_ICC.mk
+++ b/include_ICC.mk
@@ -2,8 +2,8 @@ CC  = icc
 LINKER = $(CC)
 
 OPENMP   = -qopenmp
-CFLAGS   = -Ofast -xhost -std=c11 $(OPENMP)
-LFLAGS   = $(OPENMP)
+CFLAGS   = -Ofast -xhost -std=c11 -pthread $(OPENMP)
+LFLAGS   = -pthread $(OPENMP)
 DEFINES  = -D_GNU_SOURCE
 INCLUDES =
 LIBS     =