Shader compile failure (Ubuntu 14.04 + MacBook Air 5,2)

I'm trying to open an MLV file produced with a Canon 7D and MagiLantern nightly build from 2014 April 30.

Here is the traceback produced right after selecting the MLV file in the "open" dialog box:

kevin …/Desktop/7D/mlrawviewer(master@d772151) $ ./mlrawviewer.py 
MlRawViewer v1.1.5
(c) Andrew Baldwin & contributors 2013-2014
pyAudio not available. Cannot play audio
Using GLFW
Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 14: reading configurations from ~/.fonts.conf is deprecated. please move it to /home/kevin/.config/fontconfig/fonts.conf manually
wavnames []
wavfilename /home/kevin/Desktop/7D/M01-1950.WAV
Opening MLV file /home/kevin/Desktop/7D/M01-1950.MLV
Black level: 2048 White level: 15000
FPS: 23.976 (24000/1001)
Audio frame count 0
Traceback (most recent call last):
  File "/home/kevin/Desktop/7D/mlrawviewer/GLComputeGLFW.py", line 304, in __draw
    self.onDraw(w,h)
  File "./mlrawviewer.py", line 909, in onDraw
    self.init()
  File "./mlrawviewer.py", line 892, in init
    self.demosaic = DemosaicScene(self.raw,self,self,self,size=(self.raw.width(),self.raw.height()))
  File "./mlrawviewer.py", line 278, in __init__
    self.demosaicer = Demosaicer(settings,encoder,frames)
  File "./mlrawviewer.py", line 113, in __init__
    self.shaderPatternNoise = ShaderPatternNoise()
  File "/home/kevin/Desktop/7D/mlrawviewer/ShaderPatternNoise.py", line 138, in __init__
    super(ShaderPatternNoise,self).__init__(myclass.vertex_src,myclass.fragment_src,["rawtex","rawres","orientation","blackwhite"],**kwds)
  File "/home/kevin/Desktop/7D/mlrawviewer/GLCompute.py", line 73, in __init__
    fragmentShaderHandle = compileShader(fs,GL_FRAGMENT_SHADER)
  File "/usr/lib/python2.7/dist-packages/OpenGL/GL/shaders.py", line 231, in compileShader
    shaderType,
RuntimeError:
("Shader compile failure (0): 0:28(25): error: could not implicitly convert operands to relational operator
0:28(25): error: loop condition must be scalar boolean
0:29(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:30(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:31(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:32(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:33(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:34(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:35(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:36(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:37(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:38(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:39(29): error: no matching function for call to `step(vec4, float)'; candidates are:
0:39(29): error:    vec4 step(float, vec4)
0:39(29): error:    float step(float, float)
0:39(29): error:    vec2 step(float, vec2)
0:39(29): error:    vec3 step(float, vec3)
0:39(29): error:    vec4 step(float, vec4)
0:39(29): error:    vec2 step(vec2, vec2)
0:39(29): error:    vec3 step(vec3, vec3)
0:39(29): error:    vec4 step(vec4, vec4)
0:40(52): error: no matching function for call to `step(vec4, float)'; candidates are:
0:40(52): error:    vec4 step(float, vec4)
0:40(52): error:    float step(float, float)
0:40(52): error:    vec2 step(float, vec2)
0:40(52): error:    vec3 step(float, vec3)
0:40(52): error:    vec4 step(float, vec4)
0:40(52): error:    vec2 step(vec2, vec2)
0:40(52): error:    vec3 step(vec3, vec3)
0:40(52): error:    vec4 step(vec4, vec4)
0:42(7): error: value of type vec4 cannot be assigned to variable of type float
0:44(7): error: value of type vec4 cannot be assigned to variable of type float
0:68(25): error: could not implicitly convert operands to relational operator
0:68(25): error: loop condition must be scalar boolean
0:69(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:70(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:71(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:72(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:73(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:74(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:75(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:76(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:77(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:78(8): error: initializer of type vec4 cannot be assigned to variable of type float
0:79(29): error: no matching function for call to `step(vec4, float)'; candidates are:
0:79(29): error:    vec4 step(float, vec4)
0:79(29): error:    float step(float, float)
0:79(29): error:    vec2 step(float, vec2)
0:79(29): error:    vec3 step(float, vec3)
0:79(29): error:    vec4 step(float, vec4)
0:79(29): error:    vec2 step(vec2, vec2)
0:79(29): error:    vec3 step(vec3, vec3)
0:79(29): error:    vec4 step(vec4, vec4)
0:80(52): error: no matching function for call to `step(vec4, float)'; candidates are:
0:80(52): error:    vec4 step(float, vec4)
0:80(52): error:    float step(float, float)
0:80(52): error:    vec2 step(float, vec2)
0:80(52): error:    vec3 step(float, vec3)
0:80(52): error:    vec4 step(float, vec4)
0:80(52): error:    vec2 step(vec2, vec2)
0:80(52): error:    vec3 step(vec3, vec3)
0:80(52): error:    vec4 step(vec4, vec4)
0:82(7): error: value of type vec4 cannot be assigned to variable of type float
0:84(7): error: value of type vec4 cannot be assigned to variable of type float",
['varying vec2 texcoord;
uniform vec4 rawres;
uniform float orientation;
uniform sampler2D rawtex;
uniform vec2 blackwhite;

void main() {
    float coll = 0.0;
    float colh = 0.0;
    float countl = 0.0;
    float counth = 0.0;
    if (orientation==1.0) {
        // Vertical
        float up4 = -4.0 * rawres.w;
        float up2 = -2.0 * rawres.w;
        float down2 = 2.0 * rawres.w;
        float down4 = 4.0 * rawres.w;
        if (texcoord.y<rawres.w*4.0) {
            up4 = down4;
            up2 = down2;
        }
        if (texcoord.y>(1.0-rawres.w*4.0)) {
            down4 = up4;
            down2 = up2;
        }
        float x=rawres.z*0.5;
        for (int i=0;i<rawres.x;i++) {
            float up1 = texture2D(rawtex,texcoord+vec2(x,up4));
            float up = texture2D(rawtex,texcoord+vec2(x,up2));
            float mid = texture2D(rawtex,texcoord+vec2(x,0.0));
            float down = texture2D(rawtex,texcoord+vec2(x,down2));
            float down1 = texture2D(rawtex,texcoord+vec2(x,down4));
            float lmd = mix(up,up1,step(0.0,up1-up));
            float rmd = mix(down,down1,step(0.0,down1-down));
            float med = mix(lmd,rmd,step(0.0,rmd-lmd));
            float mul = mid/med;
            float mulz = abs(mul-1.0);
            float incr = step(mulz,0.01);   
            float loh = step((mid-blackwhite.x),(64.0/65536.0));
            float nloh = 1.0 - loh;
            coll += loh * incr * mul;
            countl += loh * incr;
            colh += nloh * incr * mul;
            counth += nloh * incr;
            x=x+rawres.z;
        }
        if (countl<5.0) coll = 1.0;
        else coll = coll/countl;
        if (counth<5.0) colh = 1.0;
        else colh = colh/counth;
    }
    else {
        // Horizontal
        float left4 = -4.0 * rawres.z;
        float left2 = -2.0 * rawres.z;
        float right2 = 2.0 * rawres.z;
        float right4 = 4.0 * rawres.z;
        if (texcoord.x<rawres.z*4.0) {
            left4 = right4;
            left2 = right2;
        }
        if (texcoord.x>(1.0-rawres.z*4.0)) {
            right4 = left4;
            right2 = left2;
        }
        float y=rawres.w*0.5;
        for (int i=0;i<rawres.y;i++) {
            float lleft = texture2D(rawtex,texcoord+vec2(left4,y));
            float left = texture2D(rawtex,texcoord+vec2(left2,y));
            float mid = texture2D(rawtex,texcoord+vec2(0.0,y));
            float right = texture2D(rawtex,texcoord+vec2(right2,y));
            float rright = texture2D(rawtex,texcoord+vec2(right4,y));
            float lmd = mix(left,lleft,step(0.0,lleft-left));
            float rmd = mix(right,rright,step(0.0,rright-right));
            float med = mix(lmd,rmd,step(0.0,rmd-lmd));
            float mul = mid/med;
            float mulz = abs(mul-1.0);
            float incr = step(mulz,0.01);
            float loh = step((mid-blackwhite.x),(64.0/65536.0));
            float nloh = 1.0-loh;
            coll += loh * incr * mul;
            countl += loh * incr;
            colh += nloh * incr * mul;
            counth += nloh * incr;
            y=y+rawres.w;
        }
        if (countl<5.0) coll = 1.0;
        else coll = coll/countl;
        if (counth<5.0) colh = 1.0;
        else colh = colh/counth;
    }
    gl_FragColor = vec4(coll,colh,0.0,0.0);
}'], GL_FRAGMENT_SHADER)
Traceback (most recent call last):
  File "./mlrawviewer.py", line 1846, in <module>
    sys.exit(main())
  File "./mlrawviewer.py", line 1840, in main
    ret = rmc.run()
  File "/home/kevin/Desktop/7D/mlrawviewer/GLComputeGLFW.py", line 247, in run
    self.__idle()
  File "/home/kevin/Desktop/7D/mlrawviewer/GLComputeGLFW.py", line 336, in __idle
    self.onIdle()
  File "./mlrawviewer.py", line 1216, in onIdle
    if self.display.isDirty():
AttributeError: 'NoneType' object has no attribute 'isDirty'
kevin …/Desktop/7D/mlrawviewer(master@d772151) $

If the last issue can be naively bypassed with a patch like:

diff --git a/mlrawviewer.py b/mlrawviewer.py
index fbfcf27..625b9b0 100755
--- a/mlrawviewer.py
+++ b/mlrawviewer.py
         if self.userIdleTime()>5.0 and self.userIdleTime()<7.0:
             self.refresh()

-        if self.display.isDirty():
+        if self.display and self.display.isDirty():
             self.refresh()

         self.handleIndexing()
         self.checkForLoadedFrames()

The first traceback persist.

I'm trying to running the latest MlRawViewer under an Ubuntu 14.04 on a MacBook Air 5,2 (Intel HD Graphics 4000).

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