/usr/include/glm/gtc/vec1.hpp is in libglm-dev 0.9.9~a2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | /// @ref gtc_vec1
/// @file glm/gtc/vec1.hpp
///
/// @see core (dependence)
///
/// @defgroup gtc_vec1 GLM_GTC_vec1
/// @ingroup gtc
///
/// Include <glm/gtc/vec1.hpp> to use the features of this extension.
/// 
/// Add vec1, ivec1, uvec1 and bvec1 types.
#pragma once
// Dependency:
#include "../ext/vec1.hpp"
#if GLM_MESSAGES == GLM_MESSAGES_ENABLED && !defined(GLM_EXT_INCLUDED)
#	pragma message("GLM: GLM_GTC_vec1 extension included")
#endif
namespace glm
{
	//////////////////////////
	// vec1 definition
#if(defined(GLM_PRECISION_HIGHP_BOOL))
	typedef highp_bvec1				bvec1;
#elif(defined(GLM_PRECISION_MEDIUMP_BOOL))
	typedef mediump_bvec1			bvec1;
#elif(defined(GLM_PRECISION_LOWP_BOOL))
	typedef lowp_bvec1				bvec1;
#else
	/// 1 component vector of boolean.
	/// @see gtc_vec1 extension.
	typedef highp_bvec1				bvec1;
#endif//GLM_PRECISION
#if(defined(GLM_PRECISION_HIGHP_FLOAT))
	typedef highp_vec1				vec1;
#elif(defined(GLM_PRECISION_MEDIUMP_FLOAT))
	typedef mediump_vec1			vec1;
#elif(defined(GLM_PRECISION_LOWP_FLOAT))
	typedef lowp_vec1				vec1;
#else
	/// 1 component vector of floating-point numbers.
	/// @see gtc_vec1 extension.
	typedef highp_vec1				vec1;
#endif//GLM_PRECISION
#if(defined(GLM_PRECISION_HIGHP_DOUBLE))
	typedef highp_dvec1				dvec1;
#elif(defined(GLM_PRECISION_MEDIUMP_DOUBLE))
	typedef mediump_dvec1			dvec1;
#elif(defined(GLM_PRECISION_LOWP_DOUBLE))
	typedef lowp_dvec1				dvec1;
#else
	/// 1 component vector of floating-point numbers.
	/// @see gtc_vec1 extension.
	typedef highp_dvec1				dvec1;
#endif//GLM_PRECISION
#if(defined(GLM_PRECISION_HIGHP_INT))
	typedef highp_ivec1			ivec1;
#elif(defined(GLM_PRECISION_MEDIUMP_INT))
	typedef mediump_ivec1		ivec1;
#elif(defined(GLM_PRECISION_LOWP_INT))
	typedef lowp_ivec1			ivec1;
#else
	/// 1 component vector of signed integer numbers. 
	/// @see gtc_vec1 extension.
	typedef highp_ivec1			ivec1;
#endif//GLM_PRECISION
#if(defined(GLM_PRECISION_HIGHP_UINT))
	typedef highp_uvec1			uvec1;
#elif(defined(GLM_PRECISION_MEDIUMP_UINT))
	typedef mediump_uvec1		uvec1;
#elif(defined(GLM_PRECISION_LOWP_UINT))
	typedef lowp_uvec1			uvec1;
#else
	/// 1 component vector of unsigned integer numbers. 
	/// @see gtc_vec1 extension.
	typedef highp_uvec1			uvec1;
#endif//GLM_PRECISION
}// namespace glm
#include "vec1.inl"
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