... In /data/data/com.termux/files/home/povray31/source/unix/makefile I changed
the CFLAGS to:

CFLAGS      =  -fno-builtin-sin -fno-builtin-cos -O6 -c -ansi
-DCOMPILER_VER=\".`uname`.$(CC)\" -DPOV_LIB_DIR=\"$(POVLIBDIR)\" $(SRCINC)
$(LIBPNGINC) $(ZLIBINC)

... and adapted the libpng include and lib directives

PNGDIR = $(SRCDIR)/libpng
LIBPNGINC = -I$(PNGDIR)
LIBPNGLIB = $(PNGDIR)/libpng.a

Next, I built libpng.a and povray:

$ cd ../libpng
$ make -f scripts/makefile.lnx
$ make -j5 newunix
make[1]: Entering directory
'/data/data/com.termux/files/home/povray31/source/unix'
gcc -fno-builtin-sin -fno-builtin-cos -O6 -c -ansi
-DCOMPILER_VER=\".`uname`.gcc\"
-DPOV_LIB_DIR=\"/data/data/com.termux/files/usr/share/povray\" -I. -I..
-I../libpng -I../zlib ../atmosph.c

[...]

gcc ./atmosph.o ./bbox.o ./bcyl.o ./bezier.o ./blob.o ./boxes.o ./bsphere.o
../camera.o ./chi2.o ./colour.o ./cones.o ./csg.o ./discs.o ./express.o
../fractal.o ./gif.o ./gifdecod.o ./hcmplx.o ./hfield.o ./iff.o ./image.o
../interior.o ./lathe.o ./lbuffer.o ./lighting.o ./matrices.o ./media.o ./mem.o
../mesh.o ./normal.o ./objects.o ./octree.o ./optin.o ./optout.o ./parse.o
../parstxtr.o ./pattern.o ./pgm.o ./pigment.o ./planes.o ./png_pov.o ./point.o
../poly.o ./polygon.o ./polysolv.o ./povray.o ./ppm.o ./prism.o ./quadrics.o
../quatern.o ./rad_data.o ./radiosit.o ./ray.o ./render.o ./sor.o ./spheres.o
../super.o ./targa.o ./texture.o ./tokenize.o ./torus.o ./triangle.o ./truetype.o
../txttest.o ./userio.o ./vbuffer.o ./vlbuffer.o ./warps.o  ./unix.o
.../libpng/libpng.a -L../zlib -lz -lm -o povray

... and voila!

$ ./povray -i skyvase.pov +v1 -d +ft -x +a0.300 +r3 -q9 -w640 -h480 -mv2.0
+b1000
Persistence of Vision(tm) Ray Tracer Version 3.1g.Linux.gcc
  This is an unofficial version compiled by:
  FILL IN NAME HERE.........................
  The POV-Ray Team(tm) is not responsible for supporting this version.
Copyright 1999 POV-Ray Team(tm)
Quality settings 10 and 11 are no longer valid.
Use +QR if you need radiosity.
Parsing Options
  Input file: skyvase.pov (compatible to version 2.0)
  Remove bounds........On  Split unions........Off
  Library paths: /usr/local/lib/povray31
    /data/data/com.termux/files/usr/share/povray
    /data/data/com.termux/files/usr/share/povray/include
Output Options
  Image resolution 640 by 480 (rows 1 to 480, columns 1 to 640).
  Output file: skyvase.tga, 24 bpp Targa, 1000 KByte buffer
  Graphic display.....Off
  Mosaic preview......Off
  CPU usage histogram.Off
  Continued trace.....Off  Allow interruption..Off  Pause when done.....Off
  Verbose messages.....On
Tracing Options
  Quality:  9
  Bounding boxes.......On  Bounding threshold: 25
  Light Buffer.........On  Vista Buffer.........On
  Antialiasing.........On  (Method 1, Threshold 0.300, Depth 3, Jitter 1.00)
  Radiosity...........Off
Animation Options
  Clock value....   0.000  (Animation off)
Redirecting Options
  All Streams to console..........On
  Debug Stream to console.........On
  Fatal Stream to console.........On
  Render Stream to console........On
  Statistics Stream to console....On
  Warning Stream to console.......On


Parsing...........

Creating bounding slabs.
Scene contains 6 frame level objects; 3 infinite.

  0:00:25 Rendering line  480 of  480 supersampled 10 times.
Done Tracing
skyvase.pov Statistics, Resolution 640 x 480
----------------------------------------------------------------------------
Pixels:          307840   Samples:          395800   Smpls/Pxl: 1.29
Rays:           1642165   Saved:             10830   Max Level: 13/20
----------------------------------------------------------------------------
Ray->Shape Intersection          Tests       Succeeded  Percentage
----------------------------------------------------------------------------
CSG Intersection               5293982          485831      9.18
Plane                         31763892        17019174     53.58
Quadric                        5293982         2257576     42.64
Sphere                         5293982          786477     14.86
----------------------------------------------------------------------------
Calls to Noise:            1701193   Calls to DNoise:        3165208
----------------------------------------------------------------------------
Shadow Ray Tests:          6093936   Succeeded:               139802
Reflected Rays:            1246365
----------------------------------------------------------------------------
Smallest Alloc:                 12 bytes   Largest:          1024008
Peak memory used:          1113872 bytes
----------------------------------------------------------------------------
Time For Trace:    0 hours  0 minutes  25.0 seconds (25 seconds)
    Total Time:    0 hours  0 minutes  25.0 seconds (25 seconds)

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