diff --git a/glm/detail/type_mat2x2.hpp b/glm/detail/type_mat2x2.hpp
index f3ea0f9e..ad160b20 100644
--- a/glm/detail/type_mat2x2.hpp
+++ b/glm/detail/type_mat2x2.hpp
@@ -54,7 +54,7 @@ namespace glm
 		template <typename U, precision Q>
 		friend tvec2<U, Q> operator/(tvec2<U, Q> const & v, tmat2x2<U, Q> const & m);
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 2;
 				static GLM_CONSTEXPR length_t columns = 2;
diff --git a/glm/detail/type_mat2x3.hpp b/glm/detail/type_mat2x3.hpp
index cbd88424..af37884e 100644
--- a/glm/detail/type_mat2x3.hpp
+++ b/glm/detail/type_mat2x3.hpp
@@ -50,7 +50,7 @@ namespace glm
 		typedef tmat3x2<T, P> transpose_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 2;
 				static GLM_CONSTEXPR length_t cols = 3;
diff --git a/glm/detail/type_mat2x4.hpp b/glm/detail/type_mat2x4.hpp
index 3deb880d..48521460 100644
--- a/glm/detail/type_mat2x4.hpp
+++ b/glm/detail/type_mat2x4.hpp
@@ -50,7 +50,7 @@ namespace glm
 		typedef tmat4x2<T, P> transpose_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 2;
 				static GLM_CONSTEXPR length_t cols = 4;
diff --git a/glm/detail/type_mat3x2.hpp b/glm/detail/type_mat3x2.hpp
index 69feddcf..d5480432 100644
--- a/glm/detail/type_mat3x2.hpp
+++ b/glm/detail/type_mat3x2.hpp
@@ -50,7 +50,7 @@ namespace glm
 		typedef tmat2x3<T, P> transpose_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 3;
 				static GLM_CONSTEXPR length_t cols = 2;
diff --git a/glm/detail/type_mat3x4.hpp b/glm/detail/type_mat3x4.hpp
index 193d48f9..8074ea43 100644
--- a/glm/detail/type_mat3x4.hpp
+++ b/glm/detail/type_mat3x4.hpp
@@ -50,7 +50,7 @@ namespace glm
 		typedef tmat4x3<T, P> transpose_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 3;
 				static GLM_CONSTEXPR length_t cols = 4;
diff --git a/glm/detail/type_mat4x2.hpp b/glm/detail/type_mat4x2.hpp
index 8fb47a1b..3bc73706 100644
--- a/glm/detail/type_mat4x2.hpp
+++ b/glm/detail/type_mat4x2.hpp
@@ -50,7 +50,7 @@ namespace glm
 		typedef tmat2x4<T, P> transpose_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 4;
 				static GLM_CONSTEXPR length_t cols = 2;
diff --git a/glm/detail/type_mat4x3.hpp b/glm/detail/type_mat4x3.hpp
index d5502baa..a0ff185c 100644
--- a/glm/detail/type_mat4x3.hpp
+++ b/glm/detail/type_mat4x3.hpp
@@ -50,7 +50,7 @@ namespace glm
 		typedef tmat3x4<T, P> transpose_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 4;
 				static GLM_CONSTEXPR length_t cols = 3;
diff --git a/glm/detail/type_mat4x4.hpp b/glm/detail/type_mat4x4.hpp
index 682a1f87..0973fd83 100644
--- a/glm/detail/type_mat4x4.hpp
+++ b/glm/detail/type_mat4x4.hpp
@@ -49,7 +49,7 @@ namespace glm
 		typedef tmat4x4<T, P> transpose_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 4;
 				static GLM_CONSTEXPR length_t cols = 4;
diff --git a/glm/detail/type_vec1.hpp b/glm/detail/type_vec1.hpp
index 500a3ccb..d346cb89 100644
--- a/glm/detail/type_vec1.hpp
+++ b/glm/detail/type_vec1.hpp
@@ -55,13 +55,13 @@ namespace glm
 		typedef tvec1<bool, P> bool_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 1;
 				static GLM_CONSTEXPR precision precision = P;
 #			else
 				static const length_t components = 1;
-				static const precision precision = P;
+				static const precision prec = P;
 #			endif
 #		endif//GLM_META_PROG_HELPERS
 
diff --git a/glm/detail/type_vec2.hpp b/glm/detail/type_vec2.hpp
index 0c4f0663..d25de4ea 100644
--- a/glm/detail/type_vec2.hpp
+++ b/glm/detail/type_vec2.hpp
@@ -55,7 +55,7 @@ namespace glm
 		typedef tvec2<bool, P> bool_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 2;
 				static GLM_CONSTEXPR precision prec = P;
diff --git a/glm/detail/type_vec3.hpp b/glm/detail/type_vec3.hpp
index a010e5d0..b0abde48 100644
--- a/glm/detail/type_vec3.hpp
+++ b/glm/detail/type_vec3.hpp
@@ -55,7 +55,7 @@ namespace glm
 		typedef tvec3<bool, P> bool_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 3;
 				static GLM_CONSTEXPR precision prec = P;
diff --git a/glm/detail/type_vec4.hpp b/glm/detail/type_vec4.hpp
index 574596a5..c0f07661 100644
--- a/glm/detail/type_vec4.hpp
+++ b/glm/detail/type_vec4.hpp
@@ -109,7 +109,7 @@ namespace detail
 		typedef tvec4<bool, P> bool_type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 4;
 				static GLM_CONSTEXPR precision prec = P;
diff --git a/glm/gtc/quaternion.hpp b/glm/gtc/quaternion.hpp
index bb2c4494..97c7dc50 100644
--- a/glm/gtc/quaternion.hpp
+++ b/glm/gtc/quaternion.hpp
@@ -65,7 +65,7 @@ namespace glm
 		typedef tquat<T, P> type;
 		typedef T value_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 4;
 				static GLM_CONSTEXPR precision prec = P;
diff --git a/glm/gtx/dual_quaternion.hpp b/glm/gtx/dual_quaternion.hpp
index 87349caa..10ffa836 100644
--- a/glm/gtx/dual_quaternion.hpp
+++ b/glm/gtx/dual_quaternion.hpp
@@ -64,7 +64,7 @@ namespace glm
 		typedef T value_type;
 		typedef glm::tquat<T, P> part_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 8;
 				static GLM_CONSTEXPR precision prec = P;
diff --git a/glm/gtx/simd_mat4.hpp b/glm/gtx/simd_mat4.hpp
index 0a81fd40..649bdef2 100644
--- a/glm/gtx/simd_mat4.hpp
+++ b/glm/gtx/simd_mat4.hpp
@@ -71,7 +71,7 @@ namespace detail
 		typedef fmat4x4SIMD type;
 		typedef fmat4x4SIMD transpose_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 4;
 				static GLM_CONSTEXPR length_t cols = 4;
diff --git a/glm/gtx/simd_quat.hpp b/glm/gtx/simd_quat.hpp
index 600d49f7..8595bc99 100644
--- a/glm/gtx/simd_quat.hpp
+++ b/glm/gtx/simd_quat.hpp
@@ -76,7 +76,7 @@ namespace detail
 		typedef fquatSIMD type;
 		typedef tquat<bool, defaultp> bool_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 4;
 				static GLM_CONSTEXPR precision prec = defaultp;
diff --git a/glm/gtx/simd_vec4.hpp b/glm/gtx/simd_vec4.hpp
index 27352c53..d576bbc2 100644
--- a/glm/gtx/simd_vec4.hpp
+++ b/glm/gtx/simd_vec4.hpp
@@ -99,7 +99,7 @@ namespace detail
 		typedef fvec4SIMD type;
 		typedef tvec4<bool, highp> bool_type;
 
-#		if GLM_META_PROG_HELPERS
+#		ifdef GLM_META_PROG_HELPERS
 #			if GLM_HAS_CONSTEXPR
 				static GLM_CONSTEXPR length_t components = 4;
 				static GLM_CONSTEXPR precision prec = defaultp;
diff --git a/test/core/core_type_vec2.cpp b/test/core/core_type_vec2.cpp
index 590ad3f0..cf608f9f 100644
--- a/test/core/core_type_vec2.cpp
+++ b/test/core/core_type_vec2.cpp
@@ -29,6 +29,7 @@
 /// @author Christophe Riccio
 ///////////////////////////////////////////////////////////////////////////////////
 
+#define GLM_META_PROG_HELPERS
 #define GLM_SWIZZLE
 #include <glm/vector_relational.hpp>
 #include <glm/vec2.hpp>
diff --git a/test/core/core_type_vec3.cpp b/test/core/core_type_vec3.cpp
index cdd5f6d3..a1a8f9f9 100644
--- a/test/core/core_type_vec3.cpp
+++ b/test/core/core_type_vec3.cpp
@@ -29,6 +29,7 @@
 /// @author Christophe Riccio
 ///////////////////////////////////////////////////////////////////////////////////
 
+#define GLM_META_PROG_HELPERS
 #define GLM_SWIZZLE
 #include <glm/vector_relational.hpp>
 #include <glm/geometric.hpp>
diff --git a/test/core/core_type_vec4.cpp b/test/core/core_type_vec4.cpp
index f899c9c9..37d6afbe 100644
--- a/test/core/core_type_vec4.cpp
+++ b/test/core/core_type_vec4.cpp
@@ -30,6 +30,7 @@
 ///////////////////////////////////////////////////////////////////////////////////
 
 //#define GLM_FORCE_AVX2
+#define GLM_META_PROG_HELPERS
 #define GLM_SWIZZLE
 #include <glm/vector_relational.hpp>
 #include <glm/vec2.hpp>
diff --git a/test/gtc/gtc_quaternion.cpp b/test/gtc/gtc_quaternion.cpp
index 6a8d344b..d9b3ddf1 100644
--- a/test/gtc/gtc_quaternion.cpp
+++ b/test/gtc/gtc_quaternion.cpp
@@ -29,6 +29,7 @@
 /// @author Christophe Riccio
 ///////////////////////////////////////////////////////////////////////////////////
 
+#define GLM_META_PROG_HELPERS
 #include <glm/gtc/quaternion.hpp>
 #include <glm/gtc/epsilon.hpp>
 #include <glm/vector_relational.hpp>